[Federal Register Volume 89, Number 202 (Friday, October 18, 2024)]
[Rules and Regulations]
[Pages 83990-84026]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2024-23907]



[[Page 83989]]

Vol. 89

Friday,

No. 202

October 18, 2024

Part III





 Department of Energy





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10 CFR Part 430





Energy Conservation Program: Energy Conservation Standards for Consumer 
Furnace Fans; Final Rule

Federal Register / Vol. 89 , No. 202 / Friday, October 18, 2024 / 
Rules and Regulations

[[Page 83990]]


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DEPARTMENT OF ENERGY

10 CFR Part 430

[EERE-2021-BT-STD-0029]
RIN 1904-AE64


Energy Conservation Program: Energy Conservation Standards for 
Consumer Furnace Fans

AGENCY: Office of Energy Efficiency and Renewable Energy, Department of 
Energy.

ACTION: Final determination.

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SUMMARY: The Energy Policy and Conservation Act, as amended (``EPCA''), 
prescribes energy conservation standards for various consumer products 
and certain commercial and industrial equipment, including consumer 
furnace fans. EPCA also requires the U.S. Department of Energy 
(``DOE'') to periodically review its existing standards to determine 
whether more-stringent, amended standards would be technologically 
feasible and economically justified, and would result in significant 
energy savings. In this final determination, DOE has determined the 
energy conservation standards for consumer furnace fans do not need to 
be amended.

DATES: The effective date of this final determination is November 18, 
2024.

ADDRESSES: The docket for this activity, which includes Federal 
Register notices, public meeting attendee lists and transcripts, 
comments, and other supporting documents/materials, is available for 
review at www.regulations.gov. All documents in the docket are listed 
in the www.regulations.gov index. However, not all documents listed in 
the index may be publicly available, such as information that is exempt 
from public disclosure.
    The docket web page can be found at www.regulations.gov/docket/EERE-2021-BT-STD-0029. The docket web page contains instructions on how 
to access all documents, including public comments, in the docket.

FOR FURTHER INFORMATION CONTACT: 
    Ms. Julia Hegarty, U.S. Department of Energy, Office of Energy 
Efficiency and Renewable Energy, Building Technologies Office, EE-5B, 
1000 Independence Avenue SW, Washington, DC 20585-0121. Telephone: 
(240) 597-6737 Email: <a href="/cdn-cgi/l/email-protection#83c2f3f3efeae2ede0e6d0f7e2ede7e2f1e7f0bfe2a3ebf1e6e5be" mailto:Questions@ee.doe.gov"><span class="__cf_email__" data-cfemail="e0b195859394898f8e93a08585ce848f85ce878f96">[email protected]</span></a>">ApplianceStandards<a href="/cdn-cgi/l/email-protection#84d5f1e1f7f0edebeaf7c4e1e1aae0ebe1aae3ebf2"><span class="__cf_email__" data-cfemail="da8bafbfa9aeb3b5b4a99abfbff4beb5bff4bdb5ac">[email protected]</span></a></a>.
    Mr. Eric Stas, U.S. Department of Energy, Office of the General 
Counsel, GC-33, 1000 Independence Avenue SW, Washington, DC 20585-0121. 
Telephone: (202) 586-4798. Email: <a href="/cdn-cgi/l/email-protection#6421160d074a37100517240c154a000b014a030b12"><span class="__cf_email__" data-cfemail="4702352e246914332634072f366923282269202831">[email protected]</span></a>.
    For further information on how to review the docket, contact the 
Appliance and Equipment Standards Program staff at (202) 287-1445 or by 
email: <a href="/cdn-cgi/l/email-protection#24655454484d454a47417750454a40455640571845044c56414219" mailto:Questions@ee.doe.gov"><span class="__cf_email__" data-cfemail="db8aaebea8afb2b4b5a89bbebef5bfb4bef5bcb4ad">[email protected]</span></a>">ApplianceStandards<a href="/cdn-cgi/l/email-protection#6c3d19091f180503021f2c090942080309420b031a"><span class="__cf_email__" data-cfemail="a6f7d3c3d5d2cfc9c8d5e6c3c388c2c9c388c1c9d0">[email protected]</span></a></a>.

SUPPLEMENTARY INFORMATION:

Table of Contents

I. Synopsis of the Final Determination
II. Introduction
    A. Authority
    B. Background
    1. Current Standards
    2. Current Rulemaking History
III. General Discussion and Rationale
    A. General Comments
    B. Product Classes and Scope of Coverage
    C. Test Procedure
    D. Technological Feasibility
    1. General Considerations
    2. Maximum Technologically Feasible Levels
    E. Energy Savings
    1. Determination of Savings
    2. Significance of Savings
    F. Cost-Effectiveness
    G. Further Considerations
    1. Economic Impact on Manufacturers and Consumers
    2. Savings in Operating Costs Compared To Increase in Price
    3. Energy Savings
    4. Lessening of Utility or Performance of Products
    5. Impact of Any Lessening of Competition
    6. Need for National Energy Conservation
    7. Other Factors
IV. Methodology and Discussion of Related Comments
    A. Market and Technology Assessment
    1. Product Classes and Scope of Coverage
    2. Technology Options
    3. Impact From Other Rulemakings
    4. Screening Analysis
    a. Screened-Out Technologies
    b. Remaining Technologies
    B. Engineering and Cost Analysis
    1. Efficiency Analysis
    a. Baseline Efficiency
    b. Intermediate Efficiency Levels
    c. Maximum Technology (``Max-Tech'') Efficiency Levels
    d. Summary of Efficiency Levels Analyzed
    2. Cost Analysis
    a. Teardown Analysis
    b. Cost Estimation Method
    3. Cost-Efficiency Results
    C. Markups Analysis
    D. Energy Use Analysis
    E. Life-Cycle Cost and Payback Period Analysis
    1. Product Cost
    2. Installation Cost
    3. Annual Energy Consumption
    4. Energy Prices
    5. Maintenance and Repair Costs
    6. Product Lifetime
    7. Discount Rates
    8. Energy-Efficiency Distribution in the No-New-Standards Case
    9. Payback Period Analysis
    F. Shipments Analysis
    G. National Impact Analysis
    1. Product Efficiency Trends
    2. National Energy Savings
    3. Net Present Value Analysis
    H. Other Factors Related to Backward-Inclined Impellers
V. Analytical Results and Conclusions
    A. Economic Impacts on Individual Consumers
    B. National Impact Analysis
    1. National Energy Savings
    2. Net Present Value of Consumer Costs and Benefits
    C. Final Determination
    1. BPM Motor With Backward-Inclined Impellers
    2. BPM Motors With Forward-Inclined Impellers
    3. Summary
VI. Procedural Issues and Regulatory Review
    A. Review Under Executive Orders 12866, 13563, and 14094
    B. Review Under the Regulatory Flexibility Act
    C. Review Under the Paperwork Reduction Act of 1995
    D. Review Under the National Environmental Policy Act of 1969
    E. Review Under Executive Order 13132
    F. Review Under Executive Order 12988
    G. Review Under the Unfunded Mandates Reform Act of 1995
    H. Review Under the Treasury and General Government 
Appropriations Act, 1999
    I. Review Under Executive Order 12630
    J. Review Under the Treasury and General Government 
Appropriations Act, 2001
    K. Review Under Executive Order 13211
    L. Review Under the Information Quality Bulletin for Peer Review
    M. Congressional Notification
VII. Approval of the Office of the Secretary

I. Synopsis of the Final Determination

    The Energy Policy and Conservation Act, Public Law 94-163, as 
amended (``EPCA''),\1\ authorizes DOE to regulate the energy efficiency 
of a number of consumer products and certain industrial equipment. (42 
U.S.C. 6291-6317, as codified) Title III, Part B \2\ of EPCA 
established the Energy Conservation Program for Consumer Products Other 
Than Automobiles. (42 U.S.C. 6291-6309) These products include consumer 
furnace fans, the subject of this final determination. (42 U.S.C. 
6295(f)(4)(D))
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    \1\ All references to EPCA in this document refer to the statute 
as amended through the Energy Act of 2020, Public Law 116-260 (Dec. 
27, 2020), which reflects the last statutory amendments that impact 
Parts A and A-1 of EPCA.
    \2\ For editorial reasons, upon codification in the U.S. Code, 
Part B was redesignated Part A.
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    Pursuant to EPCA, DOE is required to review its existing energy 
conservation standards for covered consumer products no later than six 
years after issuance of any final rule establishing or amending a 
standard. (42 U.S.C. 6295(m)(1)) Pursuant to that statutory provision, 
DOE must publish either a

[[Page 83991]]

notification of determination that standards for the product do not 
need to be amended, or a notice of proposed rulemaking (``NOPR'') 
including new proposed energy conservation standards (proceeding to a 
final rule, as appropriate). (Id.) DOE has conducted this review of the 
energy conservation standards for consumer furnace fans under EPCA's 
six-year-lookback authority described herein.
    For this final determination, DOE analyzed consumer furnace fans 
subject to energy conservation standards specified in the Code of 
Federal Regulations (``CFR'') at 10 CFR 430.32(y). DOE first analyzed 
the technological feasibility of more energy-efficient consumer furnace 
fans. For those consumer furnace fans for which DOE determined higher 
standards to be technologically feasible, DOE evaluated whether higher 
standards would be cost-effective for consumers by conducting life-
cycle cost (``LCC'') and payback period (``PBP'') analyses. In 
addition, DOE estimated energy savings that would result from potential 
energy conservation standards by conducting a national impact analysis 
(``NIA''), in which it estimated the net present value (``NPV'') of the 
total costs and benefits experienced by consumers.
    Based on the results of the analyses, summarized in section V of 
this document, DOE has determined that the current standards for 
consumer furnace fans do not need to be amended and is issuing this 
final determination accordingly.

II. Introduction

    The following sections briefly discuss the statutory authority 
underlying this final determination, as well as some of the historical 
background relevant to the establishment of energy conservation 
standards for consumer furnace fans.

A. Authority

    Among other things, EPCA authorizes DOE to regulate the energy 
efficiency of a number of consumer products and certain industrial 
equipment. (42 U.S.C. 6291-6317, as codified) Title III, Part B \3\ of 
EPCA established the Energy Conservation Program for Consumer Products 
Other Than Automobiles. These products include consumer furnace fans, 
the subject of this document. (42 U.S.C. 6295(f)(4)(D)) Specifically, 
EPCA authorized DOE to establish energy conservation standards for 
electricity used for the purpose of circulating air through ductwork. 
(Id.)
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    \3\ As noted previously, for editorial reasons, upon 
codification in the U.S. Code, Part B was redesignated Part A.
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    The energy conservation program under EPCA consists essentially of 
four parts: (1) testing; (2) labeling; (3) the establishment of Federal 
energy conservation standards, and (4) certification and enforcement 
procedures. Relevant provisions of EPCA specifically include 
definitions (42 U.S.C. 6291), test procedures (42 U.S.C. 6293), 
labeling provisions (42 U.S.C. 6294), energy conservation standards (42 
U.S.C. 6295), and the authority to require information and reports from 
manufacturers (42 U.S.C. 6296).
    Federal energy efficiency requirements for covered products 
established under EPCA generally supersede State laws and regulations 
concerning energy conservation testing, labeling, and standards. (42 
U.S.C. 6297(a)-(c)) DOE may, however, grant waivers of Federal 
preemption in limited circumstances for particular State laws or 
regulations, in accordance with the procedures and other provisions set 
forth under EPCA. (42 U.S.C. 6297(d))
    Subject to certain criteria and conditions, DOE is required to 
develop test procedures to measure the energy efficiency, energy use, 
or estimated annual operating cost of each covered product. (42 U.S.C. 
6295(o)(3)(A) and 42 U.S.C. 6295(r)) Manufacturers of covered products 
must use the prescribed DOE test procedure as the basis for certifying 
to DOE that their product complies with the applicable energy 
conservation standards and as the basis for any representations 
regarding the energy use or energy efficiency of the product. (42 
U.S.C. 6293(c) and 42 U.S.C. 6295(s)) Similarly, DOE must use these 
test procedures to evaluate whether a basic model complies with the 
applicable energy conservation standard(s). (42 U.S.C. 6295(s)) The DOE 
test procedures for consumer furnace fans appear at title 10 CFR part 
430, subpart B, appendix AA.
    As noted previously, not later than six years after the issuance of 
any final rule establishing or amending a standard, DOE must publish 
either a notice of proposed determination (``NOPD'') that standards for 
the product do not need to be amended, or a NOPR including new proposed 
energy conservation standards (proceeding to a final rule, as 
appropriate). (42 U.S.C. 6295(m)(1) and (3)) EPCA further provides 
that, not later than three years the issuance of a final determination 
not to amend standards, DOE must publish either a notification of 
determination that standards for the product do not need to be amended, 
or a NOPR including new proposed energy conservation standards 
(proceeding to a final rule, as appropriate). (42 U.S.C. 6295(m)(3)(B)) 
DOE must make the analysis on which a NOPD or NOPR is based publicly 
available and provide an opportunity for written comment. (42 U.S.C. 
6295(m)(2))
    A determination that amended standards are not needed must be based 
on consideration of whether amended standards will result in 
significant conservation of energy, are technologically feasible, and 
are cost-effective. (42 U.S.C. 6295(m)(1)(A) and 42 U.S.C. 6295(n)(2)) 
Additionally, any new or amended energy conservation standard 
prescribed by the Secretary for any type (or class) of covered product 
shall be designed to achieve the maximum improvement in energy 
efficiency which the Secretary determines is technologically feasible 
and economically justified. (42 U.S.C. 6295(o)(2)(A)) Among the factors 
DOE considers in evaluating whether a proposed standard level is 
economically justified includes whether the proposed standard at that 
level is cost-effective, as defined under 42 U.S.C. 
6295(o)(2)(B)(i)(II). Under 42 U.S.C. 6295(o)(2)(B)(i)(II), an 
evaluation of cost-effectiveness requires DOE to consider savings in 
operating costs throughout the estimated average life of the covered 
products in the type (or class) compared to any increase in the price, 
initial charges, or maintenance expenses for the covered products that 
are likely to result from the standard. (42 U.S.C. 6295(n)(2) and 42 
U.S.C. 6295(o)(2)(B)(i)(II))
    Finally, pursuant to the amendments to EPCA contained in the Energy 
Independence and Security Act of 2007 (``EISA 2007''), Public Law 110-
140, any final rule for new or amended energy conservation standards 
promulgated after July 1, 2010, is required to address standby mode and 
off mode energy use. (42 U.S.C. 6295(gg)(3)) Specifically, when DOE 
adopts a standard for a covered product after that date, it must, if 
justified by the criteria for adoption of standards under EPCA (42 
U.S.C. 6295(o)), incorporate standby mode and off mode energy use into 
a single standard, or, if that is not feasible, adopt a separate 
standard for such energy use for that product. (42 U.S.C. 
6295(gg)(3)(A)-(B)) However, in a test procedure final rule for furnace 
fans published in the Federal Register on January 3, 2014, DOE has 
previously determined that there is no need to address standby mode and 
off mode energy use in the standards for consumer furnace fans, as the 
standby

[[Page 83992]]

mode and off mode energy use associated with furnace fans is accounted 
for by the standards and test procedures for the products in which 
furnace fans are used (i.e., consumer furnaces and consumer central air 
conditioners and heat pumps). 79 FR 500, 504-505. DOE maintained the 
same approach in the most recent amended test procedure for consumer 
furnace fans, which was published in the Federal Register on April 12, 
2024 (``April 2024 TP Final Rule''; 89 FR 25780, 25782) and continues 
to do so here for the reasons previously stated.
    DOE is publishing this final determination pursuant to the six-
year-lookback review requirement in EPCA.

B. Background

1. Current Standards
    DOE most recently completed a review of the subject consumer 
furnace fans standards in a final rule published in the Federal 
Register on July 3, 2014 (``July 2014 Final Rule''), through which DOE 
prescribed the current energy conservation standards for consumer 
furnace fans manufactured on and after July 3, 2019. 79 FR 38130. These 
standards are set forth in DOE's regulations at 10 CFR 430.32(y) and 
are shown in Table II.1.

                   Table II.1--Federal Energy Conservation Standards for Consumer Furnace Fans
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        Furnace fan product class *          Fan energy rating ** (watts/1,000 cubic feet per minute (``cfm''))
----------------------------------------------------------------------------------------------------------------
Non-Weatherized, Non-Condensing Gas (``NWG- FER = 0.044 * Qmax + 182.
 NC'').
Non-Weatherized, Condensing Gas (``NWG-     FER = 0.044 * Qmax + 195.
 C'').
Weatherized, Non-Condensing Gas (``WG-      FER = 0.044 * Qmax + 199.
 NC'').
Non-Weatherized, Non-Condensing Oil         FER = 0.071 * Qmax + 382.
 Furnace Fan (``NWO-NC'').
Non-Weatherized Electric Furnace/Modular    FER = 0.044 * Qmax + 165.
 Blower Fan (``NWEF/NWMB'').
Mobile Home Non-Weatherized, Non-           FER = 0.071 * Qmax + 222.
 Condensing Gas Furnace Fan (``MH-NWG-
 NC'').
Mobile Home Non-Weatherized, Condensing     FER = 0.071 * Qmax + 240.
 Gas Furnace Fan (``MH-NWG-C'').
Mobile Home Electric Furnace/Modular        FER = 0.044 * Qmax + 101.
 Blower Fan (``MH-EF/MB'').
Mobile Home Non-Weatherized Oil Furnace     Reserved.
 Fan (``MH-NWO'').
Mobile Home Weatherized Gas Furnace Fan     Reserved.
 (``MH-WG'').
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* Furnace fans incorporated into hydronic air handlers, small-duct high-velocity (``SDHV'') modular blowers,
  SDHV electric furnaces, and central air conditioners/heat pump indoor units are not subject to the standards
  listed in this table. See section IV.A.1 of this document for further discussion.
** Qmax is the airflow, in cfm, at the maximum airflow-control setting measured using the final DOE test
  procedure at 10 CFR part 430, subpart B, appendix AA.

2. Current Rulemaking History
    DOE established energy conservation standards at 10 CFR 430.32(y) 
for furnace fans through the July 2014 Final Rule. 79 FR 38130. As 
discussed in section II.A of this document, EPCA authorized DOE to 
establish energy conservation standards for electricity used for the 
purpose of circulating air through ductwork. (42 U.S.C. 6295(f)(4)(D)) 
While the statutory language allows for regulation of the electricity 
use of any electrically-powered device applied to residential central 
heating, ventilation, and air conditioning (``HVAC'') systems for the 
purpose of circulating air through ductwork, in the July 2014 Final 
Rule, DOE established standards only for certain furnace fans used in 
furnaces and modular blowers. 79 FR 38130, 38146 (July 3, 2014). 
Compliance with the prescribed standards established for consumer 
furnace fans in the July 2014 Final Rule was required as of July 3, 
2019. DOE's energy conservation standards for furnace fans use the fan 
energy rating (``FER'') metric, which is the ratio of the electrical 
energy consumption to airflow, expressed as watts per 1,000 cubic feet 
per minute of airflow (``W/1,000 cfm''). 10 CFR 430.32(y). In 
evaluating whether amended standards for furnace fans are warranted, 
DOE used the test procedure for determining FER which is established at 
10 CFR part 430, subpart B, appendix AA, ``Uniform Test Method for 
Measuring the Energy Consumption of Furnace Fans'' (``appendix AA''). 
In parallel to this rulemaking, DOE conducted a test procedure 
rulemaking that considered whether amendments were warranted for the 
current test procedure for furnace fans. On May 13, 2022, DOE published 
in the Federal Register a NOPR concerning the test procedure for 
furnace fans (``May 2022 TP NOPR''). 87 FR 29576. Subsequently, DOE 
published the April 2024 TP Final Rule. 89 FR 25780.
    In support of the present review of the consumer furnace fans 
energy conservation standards, DOE published a request for information 
(``RFI'') in the Federal Register, which identified various issues on 
which DOE sought comment to inform its determination of whether the 
standards need to be amended, on November 23, 2021 (``November 2021 
RFI''). 86 FR 66465. The following year, on November 1, 2022, DOE 
published a notice of availability of the preliminary technical support 
document (``November 2022 Preliminary Analysis'') and the accompanying 
preliminary technical support document (``November 2022 Preliminary 
Analysis TSD'') in the Federal Register. 87 FR 65687. In the November 
2022 Preliminary Analysis, DOE assessed potential amended standard 
levels for consumer furnace fans.
    On September 20, 2022, a consent decree was issued for NRDC et al. 
v. DOE and New York et al. v. DOE that mandated that a final agency 
action pertaining to energy conservation standards (i.e., a final rule 
amending energy conservation standards or a final determination not to 
amend standards) must be issued by October 31, 2024.
    On October 6, 2023, DOE published a NOPD (``October 2023 NOPD'') in 
the Federal Register, which tentatively determined that the current 
standards for consumer furnace fans do not need to be amended. 88 FR 
69826.
    DOE received comments in response to the October 2023 NOPD from the 
interested parties listed in Table II.2.

[[Page 83993]]



          Table II.2--List of Commenters With Written Submissions in Response to the October 2023 NOPD
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                                                                         Comment No. in
             Commenter(s)                        Abbreviation              the docket         Commenter type
----------------------------------------------------------------------------------------------------------------
Air-Conditioning, Heating, &           AHRI............................              32  Manufacturer Trade
 Refrigeration Institute.                                                                 Association.
Appliance Standards Awareness          Joint Advocates.................              31  Efficiency Advocacy
 Project, American Council for an                                                         Organization.
 Energy-Efficient Economy, National
 Consumer Law Center, Natural
 Resources Defense Council, New York
 State Energy Research and
 Development Authority.
Lennox International.................  Lennox..........................              30  Manufacturer.
Michael Ravnitzky....................  Ravnitzky.......................              29  Individual.
----------------------------------------------------------------------------------------------------------------

    A parenthetical reference at the end of a comment quotation or 
paraphrase provides the location of the item in the public record.\4\
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    \4\ The parenthetical reference provides a reference for 
information located in the docket. (Docket No. EERE-2021-BT-STD-
0029, which is maintained at www.regulations.gov). The references 
are arranged as follows: (commenter name, comment docket ID number, 
page of that document).
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III. General Discussion and Rationale

    DOE developed this final determination after a review of the market 
for the subject consumer furnace fans. DOE also considered comments, 
data, and information from interested parties that represent a variety 
of interests. This final determination addresses issues raised by these 
commenters.

A. General Comments

    This section summarizes general comments received from interested 
parties regarding rulemaking timing and process, as well as general 
recommendations on the standard levels.
    In response to the October 2023 NOPD, AHRI commented that it agrees 
with DOE's proposed determination, stating that it is reasonable and 
appropriate and that the energy conservation standards for consumer 
furnace fans do not need to be amended at this time. (AHRI, No. 32 at 
p. 1) Lennox commented that the October 2023 NOPD indicates that more-
stringent consumer furnace fan efficiency levels would cause most 
consumers to suffer net costs, and it supports DOE's determination to 
not amend furnace fan standards at this time. (Lennox, No. 30 at pp. 1-
3) Ravnitzky supported DOE's proposed determination, stating that the 
``cost-benefit analysis does not always demonstrate clear utility.'' 
Ravnitzky stated that DOE's analysis, which integrates durability and 
reliability design objectives, ensures that the standards developed are 
both functional and advantageous. (Ravnitzky, No. 29 at p. 1) Ravnitzky 
commented that furnace fans are used for air circulation both when the 
furnace or air conditioner is operating and during its inactive cycle, 
and that DOE's acknowledgement of furnace fan operation in both cycles 
is important to establish feasible and relevant standards. (Id.)
    Conversely, the Joint Advocates commented that DOE should adopt 
standards that effectively require brushless permanent magnet (``BPM'') 
motors for all product classes (including oil and mobile home gas 
furnaces). (Joint Advocates, No. 31 at pp. 1-2) The Joint Advocates 
commented that, because DOE's analysis shows about 90 percent of mobile 
home gas furnaces achieve an efficiency level that assumes EL 1 (i.e., 
a BPM motor), the availability of those products would likely not be 
affected by an amended standard. (Joint Advocates, No. 31 at pp. 1-2)
    As part of the rulemaking process, DOE carefully considers the 
benefits and burdens of potential amended standards to determine 
whether the potential amended standards are the maximum standard levels 
that are technologically feasible and economically justified and would 
conserve a significant amount of energy, as required by EPCA (see 42 
U.S.C. 6295(o)(2)(A) and (3)(B)). Given the small role of NWO-NC, MH-
NWG-NC, MH-NWG-C, and MH-NWO in the overall furnace market, the 
declining shipments for the affected product classes, and the number of 
products that incorporate a BPM motor today, DOE concludes that the 
energy savings potential from this design option is limited. Further, 
DOE has concerns about availability of products if standards are 
amended. If any products lines are required to be updated, that may 
lead to manufacturers to choose to leave the market, thereby 
potentially impacting consumers if the market becomes more 
concentrated. This topic is discussed further in section IV of this 
document, which outlines DOE's approach to analyzing potential amended 
standard levels, and section V of this document, which includes a 
discussion of market considerations, as well as a detailed explanation 
of DOE's weighing of the benefits and burdens and the rationale for 
proposing not to amend standards for consumer furnace fans.
    Ravnitzky recommended that DOE should mandate that manufacturers 
disclose the relative energy efficiency of the fans used in air 
handlers and air conditioners. The commenter stated that implementing 
an easily comparable metric/rating would allow consumers to make more 
energy-conscious decisions and encourage manufacturers to innovate 
their products. Ravnitzky further stated that, by mandating this 
information, DOE could create a market environment in which energy 
efficiency is a top consideration for product development and consumer 
purchasing. (Ravnitzky, No. 29 at p. 1) Further, Ravnitzky commented 
that DOE should establish a periodic review process to assess the 
standards' real-world performance and impact, evaluating the longevity, 
consumer satisfaction, and environmental benefits of the established 
standards in order to guarantee that standards adapt to technological 
advancements and market trends. (Id. at pp. 1-2) Finally, Ravnitzky 
commented that DOE should develop partnerships with industry experts 
and consumer advocacy groups to create refined and impactful energy 
conservation measures. (Id. at p. 2)
    In response, DOE notes that the electrical energy consumption of 
fans used in HVAC products such as air handlers and air conditioners 
are accounted for by the seasonal energy efficiency ratio 2 (``SEER2'') 
and heating seasonal performance factor 2 (``HSPF2'') metrics measured 
by the test procedure for central air conditioners (``CACs'') and heat 
pumps at 10 CFR part 430, subpart B, appendix M1 (``Appendix M1''). 
These products are rated using a different metric than that used for 
furnace fans, as they have different functionalities and cannot not be 
directly compared. With regard to Ravnitzky's suggestion that DOE 
establish a collaborative, periodic review process, DOE notes that, as 
outlined in section II.A of this

[[Page 83994]]

document, DOE is required to review its existing energy conservation 
standards for covered consumer products no later than six years after 
issuance of any final rule establishing or amending a standard (42 
U.S.C. 6295(m)(1)) or three years after a determination that standards 
for the product do not need to be amended. (42 U.S.C. 6295(m)(3)(B)) In 
these reviews, DOE assesses factors including the economic impact of 
standards on consumers and national energy savings to capture the real-
world impacts of amended standards. As a part of this process, DOE 
regularly engages with industry stakeholders through manufacturer 
interviews, public meetings/webinars, and written comments.

B. Product Classes and Scope of Coverage

    When evaluating and establishing energy conservation standards, DOE 
divides covered products into product classes by the type of energy 
used or by capacity or other performance-related features that justify 
differing standards. In making a determination whether a performance-
related feature justifies a different standard, DOE must consider 
factors such as the utility of the feature to the consumer and other 
factors DOE determines are appropriate. (42 U.S.C. 6295(q)) The scope 
of coverage and product classes for this final determination are 
discussed in further detail in section IV.A.1 of this document. This 
final determination covers those consumer products that meet the 
definition of a ``furnace fan'' as codified at 10 CFR 430.2. That 
provision states that a ``furnace fan'' is defined as an electrically-
powered device used in a consumer product for the purpose of 
circulating air through ductwork. Id.
    DOE did not receive any comments on product classes and scope of 
coverage in response to the October 2023 NOPD. Consequently, DOE is 
maintaining the same approach for the final determination.

C. Test Procedure

    EPCA sets forth generally applicable criteria and procedures for 
DOE's adoption and amendment of test procedures. (42 U.S.C. 6293) 
Manufacturers of covered products must use these test procedures to 
quantify the efficiency of their product and as the basis for 
certifying to DOE that their product complies with the applicable 
energy conservation standards and as the basis for any representations 
regarding the energy use or energy efficiency of the product. (42 
U.S.C. 6295(s) and 42 U.S.C. 6293(c)) Similarly, DOE must use these 
test procedures to evaluate whether a basic model complies with the 
applicable energy conservation standard(s) pursuant to EPCA. (42 U.S.C. 
6295(s); 10 CFR 429.110(e))
    The current test procedure for consumer furnace fans is codified at 
10 CFR part 430, subpart B, appendix AA, Uniform Test Method for 
Measuring the Energy Consumption of Furnace Fans. Appendix AA includes 
provisions for determining the FER, the metric on which current 
standards are based (see 10 CFR 430.32(y)). DOE most recently updated 
appendix AA on April 12, 2024, when DOE published the April 2024 TP 
Final Rule in the Federal Register. 89 FR 25780. The April 2024 TP 
Final Rule adopted the following changes:
    (1) Specify testing instructions for furnace fans incapable of 
operating at the required external static pressure (``ESP'');
    (2) Incorporate by reference the most recent versions of industry 
standards, ASHRAE 103-2017 and ASHRAE 37-2009 (RA 2019), in 10 CFR 
430.3;
    (3) Incorporate by reference chapter 1 of the 2021 ASHRAE Handbook;
    (4) Define ``dual-fuel furnace fans'' and exclude them from the 
scope of appendix AA;
    (5) Change the term ``default airflow control settings'' to 
``specified airflow control settings'';
    (6) Make clarifications to nomenclature, correct the value of the 
conversion factor from watts to British Thermal Units per hour (``Btu/
h''), and correct the units of specific volume of dry air;
    (7) Revise the ambient temperature conditions allowed during 
testing to between 65 degrees Fahrenheit (``[deg]F'') and 85 [deg]F for 
all units (both condensing and non-condensing);
    (8) Assign an allowable range of relative humidity during testing 
to be between 20 percent and 80 percent; and
    (9) Require that the power measurements be determined as an average 
over the last 30 seconds of each steady-state period at intervals of no 
less than 1 per second, rather than taken as a single point 
measurement.
    Id. at 89 FR 25780, 25783 (April 12, 2024).
    DOE did not receive any comments on the furnace fans test procedure 
in response to the October 2023 NOPD.

D. Technological Feasibility

1. General Considerations
    As discussed, a determination that amended energy conservation 
standards are not needed must be based on consideration of whether 
amended standards would result in significant conservation of energy, 
are technologically feasible, and are cost-effective. (42 U.S.C. 
6295(m)(1)(A) and 42 U.S.C. 6295(n)(2))
    To determine whether potential amended standards would be 
technologically feasible, DOE first develops a list of all known 
technologies and design options that could improve the efficiency of 
products that are the subject of the determination. DOE considers 
technologies incorporated in commercially-available products or in 
working prototypes to be ``technologically feasible.'' 10 CFR part 430, 
subpart C, appendix A, sections 6(b)(3)(i) and 7(b)(1). Section IV.A.2 
of this document discusses the technology options identified and 
considered by DOE for this analysis for consumer furnace fans.
    After DOE has determined which, if any, technologies and design 
options are technologically feasible, it further evaluates each 
technology and design option in light of the following additional 
screening criteria: (1) practicability to manufacture, install, and 
service; (2) adverse impacts on product utility or availability; (3) 
adverse impacts on health or safety; and (4) unique-pathway proprietary 
technologies. 10 CFR part 430, subpart C, appendix A, sections 
6(b)(3)(ii)-(v) and 7(b)(2)-(5). Those technology options that are 
``screened out'' based on these criteria are not considered further. 
Those technology and design options that are not screened out are 
considered as the basis for higher efficiency levels that DOE could 
consider for potential amended standards. Section IV.A.4 of this 
document discusses the results of the screening analysis conducted for 
this final determination.
2. Maximum Technologically Feasible Levels
    EPCA requires that for any proposed rule that prescribes an amended 
or new energy conservation standard or prescribes no amendment or no 
new standard for a type (or class) of covered product, DOE must 
determine the maximum improvement in energy efficiency or maximum 
reduction in energy use that is technologically feasible for each type 
(or class) of covered products. (42 U.S.C. 6295(p)(1)) Accordingly, in 
the engineering analysis, DOE identifies the maximum technologically 
feasible efficiency level currently available on the market for 
consumer furnace fans. DOE also defines such ``max-tech'' efficiency 
level, representing the maximum

[[Page 83995]]

theoretical efficiency that can be achieved through the application of 
all available technology options retained from the screening 
analysis.\5\ In many cases, the max-tech efficiency level is not 
commercially available because it is not currently economically 
feasible. The max-tech levels that DOE determined for this analysis are 
described in section IV.B.1.c of this final determination.
---------------------------------------------------------------------------

    \5\ In applying these design options, DOE would only include 
those that are compatible with each other that when combined, would 
represent the theoretical maximum possible efficiency.
---------------------------------------------------------------------------

E. Energy Savings

1. Determination of Savings
    For each efficiency level (``EL'') evaluated, DOE projects 
anticipated energy savings from application of the EL to the consumer 
furnace fan products purchased during the 30-year period that begins in 
the assumed year of compliance with potential amended standards (2030-
2059).\6\ The savings are measured over the entire lifetime of products 
purchased during the 30-year analysis period. DOE quantifies the energy 
savings attributable to each EL as the difference in energy consumption 
between each standards case and the no-new-standards case. The no-new-
standards case represents a projection of energy consumption that 
reflects how the market for such products would likely evolve in the 
absence of amended energy conservation standards.
---------------------------------------------------------------------------

    \6\ DOE also presents a sensitivity analysis that considers 
impacts for products shipped in a nine-year period.
---------------------------------------------------------------------------

    DOE uses its NIA spreadsheet models to estimate national energy 
savings (``NES'') from potential amended standards for the products 
analyzed. The NIA spreadsheet model (described in section IV.G of this 
document) calculates energy savings in terms of site energy, which is 
the energy directly consumed by the products at the locations where 
they are used. For electricity, DOE reports NES in terms of primary 
energy savings, which is the savings in the energy that is used to 
generate and transmit the site electricity. For natural gas, the 
primary energy savings are considered to be equal to the site energy 
savings. DOE also calculates NES in terms of full-fuel-cycle (``FFC'') 
energy savings. The FFC metric includes the energy consumed in 
extracting, processing, and transporting primary fuels (i.e., coal, 
natural gas, petroleum fuels), and, thus, presents a more complete 
picture of the impacts of energy conservation standards.\7\ DOE's 
approach is based on the calculation of an FFC multiplier for each of 
the energy types used by covered products. Section IV.G.2 of this 
document provides more information on FFC energy savings.
---------------------------------------------------------------------------

    \7\ The FFC metric is discussed in DOE's statement of policy and 
notice of policy amendment. 76 FR 51281 (August 18, 2011), as 
amended at 77 FR 49701 (August 17, 2012).
---------------------------------------------------------------------------

2. Significance of Savings
    As discussed, a determination that amended standards are not needed 
must be based on consideration of whether amended standards will result 
in significant conservation of energy, among other factors. (42 U.S.C. 
6295(m)(1)(A) and 42 U.S.C. 6295(n)(2))
    The significance of energy savings offered by a new or amended 
energy conservation standard cannot be determined without knowledge of 
the specific circumstances surrounding a given rulemaking.\8\ For 
example, for some covered products, most of the energy consumption 
occurs during periods of peak energy demand. The impacts of these 
products on the energy infrastructure can be more pronounced than the 
impacts of products with relatively constant demand. Accordingly, DOE 
evaluates the significance of energy savings on a case-by-case basis. 
The significance of energy savings is further discussed in section 
V.B.1 of this final determination.
---------------------------------------------------------------------------

    \8\ The numeric threshold for determining the significance of 
energy savings established in a final rule published in the Federal 
Register on February 14, 2020 (85 FR 8626, 8670) was subsequently 
eliminated in a final rule published in the Federal Register on 
December 13, 2021 (86 FR 70892).
---------------------------------------------------------------------------

F. Cost-Effectiveness

    As discussed, a determination that amended standards are not needed 
must be based on consideration of whether amended standards would be 
cost-effective, among other factors. (42 U.S.C. 6295(m)(1)(A) and 42 
U.S.C. 6295(n)(2))
    In evaluating cost-effectiveness, EPCA requires DOE to consider 
savings in operating costs throughout the estimated average life of the 
covered product in the type (or class) compared to any increase in the 
price, initial charges, or maintenance expenses for the covered product 
that are likely to result from the standard. (42 U.S.C. 6295(n)(2)(c) 
and 42 U.S.C. 6295(o)(2)(B)(i)(II)) Cost-effectiveness is also one of 
the factors that DOE considers under 42 U.S.C. 6295(o)(2)(B) in 
determining whether new or amended standards are economically 
justified. (42 U.S.C. 6295(o)(2)(B)(i)(II))
    In determining cost-effectiveness of potential amended standards 
for covered products, DOE generally conducts LCC and PBP analyses that 
estimate the costs and benefits to users from potential standards. 
Section IV.E of this document provides more information on the LCC and 
PBP analyses conducted for this final determination. To further inform 
DOE's consideration of the cost-effectiveness of potential amended 
standards, DOE considered the NPV of total costs and benefits estimated 
as part of the NIA. The inputs for determining the NPV of the total 
costs and benefits experienced by consumers are: (1) total annual 
installed cost, (2) total annual operating costs (energy costs and 
repair and maintenance costs), and (3) a discount factor to calculate 
the present value of costs and savings. The results of this analysis 
are discussed in section V.C.3 of this document.

G. Further Considerations

    In determining whether a potential, more-stringent standard is 
economically justified, DOE must determine whether the benefits of the 
standard exceed its burdens. (42 U.S.C. 6295(o)(2)(B)(i)) DOE must make 
this determination after receiving comments on the proposed standard, 
and by considering, to the greatest extent practicable, the following 
seven statutory factors:
    (1) The economic impact of the standard on manufacturers and 
consumers of the product subject to the standard;
    (2) The savings in operating costs throughout the estimated average 
life of the covered product in the type (or class) compared to any 
increase in the price, initial charges for, or maintenance expenses of 
the covered product that are likely to result from the standard;
    (3) The total projected amount of energy (or as applicable, water) 
savings likely to result directly from the standard;
    (4) Any lessening of the utility or the performance of the covered 
product likely to result from the standard;
    (5) The impact of any lessening of competition, as determined in 
writing by the Attorney General, that is likely to result from the 
standard;
    (6) The need for national energy and water conservation; and
    (7) Other factors the Secretary considers relevant.
    (42 U.S.C. 6295(o)(2)(B)(i)(I)-(VII))
    The following sections discuss how DOE has addressed each of these 
seven factors in this final determination.
1. Economic Impact on Manufacturers and Consumers
    In determining the impacts of a potential new or amended standard 
on manufacturers, DOE conducts a manufacturing impact analysis 
(``MIA''). DOE first uses an annual cash-flow approach to determine the 
quantitative impacts. This step includes both a short-

[[Page 83996]]

term assessment--based on the cost and capital requirements during the 
period between when a regulation is issued and when entities must 
comply with the regulation--and a long-term assessment over a 30-year 
period. The industry-wide impacts analyzed include: (1) industry net 
present value, which values the industry on the basis of expected 
future cash flows; (2) cash flows by year; (3) changes in revenue and 
income; and (4) other measures of impact, as appropriate. Since DOE has 
determined not to amend the standards for consumer furnace fans, this 
final determination will have no cash-flow impacts on manufacturers. 
Accordingly, DOE did not conduct an MIA for this final determination.
    For individual consumers, measures of economic impact include the 
changes in LCC and PBP associated with new or amended standards. These 
measures are discussed further in the following section. For consumers 
in the aggregate, DOE also calculates the national NPV of the consumer 
costs and benefits expected to result from particular standards. DOE 
also evaluates the impacts of potential standards on identifiable 
subgroups of consumers that may be affected disproportionately by a 
standard. Since DOE has determined not to amend the standards for 
consumer furnace fans, this final determination will have no 
disproportionate impact on identifiable subgroups of consumers. 
Accordingly, DOE did not conduct a subgroup analysis for this final 
determination.
2. Savings in Operating Costs Compared To Increase in Price
    EPCA requires DOE to consider the savings in operating costs 
throughout the estimated average life of the covered product in the 
type (or class) compared to any increase in the price of, or in the 
initial charges for, or maintenance expenses of, the covered products 
that are likely to result from a standard. (42 U.S.C. 6295(m)(1); 42 
U.S.C. 6295(n)(2), and 42 U.S.C. 6295(o)(2)(B)(i)(II)) DOE conducts 
this comparison in its LCC and PBP analyses.
    For its LCC and PBP analyses, DOE assumes that consumers will 
purchase the covered product in the first year of compliance with new 
or amended standards. The LCC savings for the considered efficiency 
levels are calculated relative to the case that reflects projected 
market trends in the absence of new or amended standards. DOE's LCC and 
PBP analyses is discussed in further detail in section IV.E of this 
document.
3. Energy Savings
    EPCA requires DOE, in determining the economic justification of an 
amended standard, to consider the total projected energy savings that 
are expected to result directly from the standard. (42 U.S.C. 
6295(o)(2)(B)(i)(III))
    As discussed in section IV.G of this document, DOE uses the NIA 
spreadsheet models to project national energy savings that are expected 
to result directly from an amended standard.
4. Lessening of Utility or Performance of Products
    In establishing product classes and in evaluating design options 
and the impact of potential standard levels, DOE evaluates potential 
standards that would not lessen the utility or performance of the 
considered product. (42 U.S.C. 6295(o)(2)(B)(i)(IV)) Since DOE has 
determined not to amend the standards for consumer furnace fans, this 
final determination will not impact the utility of such products.
5. Impact of Any Lessening of Competition
    EPCA directs DOE to consider the impact of any lessening of 
competition, as determined in writing by the Attorney General, that is 
likely to result from a standard. (42 U.S.C. 6295(o)(2)(B)(i)(V)) Since 
DOE has determined not to amend the standards for consumer furnace 
fans, DOE did not transmit a copy of its determination to the Attorney 
General for anti-competitive review.
6. Need for National Energy Conservation
    DOE also considers the need for national energy conservation in 
determining whether a new or amended standard is economically 
justified. (42 U.S.C. 6295(o)(2)(B)(i)(VI)) The energy savings from the 
standards are likely to provide improvements to the security and 
reliability of the Nation's energy system. Reductions in the demand for 
electricity also may result in reduced costs for maintaining the 
reliability of the Nation's electricity system. DOE generally conducts 
a utility impact analysis to estimate how standards may affect the 
Nation's needed power generation capacity. However, since DOE has 
determined not to amend the standards for consumer furnace fans, DOE 
did not conduct this analysis.
    DOE maintains that environmental and public health benefits 
associated with the more efficient use of energy are important to take 
into account when considering the need for national energy 
conservation. Amended standards are likely to result in environmental 
benefits in the form of reduced emissions of air pollutants and 
greenhouse gases associated with energy production and use. DOE 
generally conducts an emissions analysis to estimate how amended 
standards may affect these emissions. DOE also generally estimates the 
economic value of emissions reductions resulting from an amended 
standard. However, since DOE has determined not to amend the standards 
for consumer furnace fans, DOE did not conduct this analysis.
7. Other Factors
    In determining whether an energy conservation standard is 
economically justified, DOE may consider any other factors that the 
Secretary deems to be relevant. (42 U.S.C. 6295(o)(2)(B)(i)(VII)) To 
the extent DOE identifies any relevant information regarding economic 
justification that does not fit into the other categories described 
previously, DOE could consider such information under ``other 
factors.''

IV. Methodology and Discussion of Related Comments

    The following sections of this document address each key component 
of the analyses DOE has performed for this final determination with 
respect to consumer furnace fans. Comments received from interested 
parties are addressed in each relevant section.

A. Market and Technology Assessment

    DOE develops information in the market and technology assessment 
that provides an overall picture of the market for the products 
concerned, including the purpose of the products, the industry 
structure, manufacturers, market characteristics, and technologies used 
in the products. This activity includes both quantitative and 
qualitative assessments, based primarily on publicly-available 
information. The subjects addressed in the market and technology 
assessment for this final determination include: (1) identification of 
the scope and product classes, (2) manufacturers and industry 
structure, (3) existing efficiency programs, (4) shipments information, 
(5) market and industry trends, and (6) technologies or design options 
for improving efficiency of consumer furnace fans. The key findings of 
DOE's market assessment are summarized in the following sections.
1. Product Classes and Scope of Coverage
    In the October 2023 NOPD, DOE evaluated products within the same 
scope as those products for which DOE initially established energy 
conservation

[[Page 83997]]

standards in the July 2014 Final Rule. 88 FR 69826, 69832 (Oct. 6, 
2023). In this final determination, DOE is maintaining the scope of 
coverage as presented in the October 2023 NOPD. Products evaluated in 
this final determination include:
    <bullet> Furnace fans used in weatherized and non-weatherized gas 
furnaces, oil furnaces, and electric furnaces; and
    <bullet> Modular blowers
    Consistent with the approach taken in the July 2014 Final Rule, 
products not addressed in this rulemaking include:
    <bullet> Furnace fans used in other products, such as split-system 
CACs and heat pump indoor units, through-the-wall indoor units, small-
duct high-velocity indoor units, energy recovery ventilators, heat 
recovery ventilators, draft inducer fans, exhaust fans, and hydronic 
air handlers; and
    <bullet> Fans used in any non-ducted products, such as whole-house 
ventilation systems without ductwork, CAC condensing unit fans, room 
fans, and furnace draft inducer fans (because these products do not 
circulate air through ductwork).
    DOE has previously determined that the DOE test procedure for 
furnace fans is not currently equipped to address fans contained in 
CACs, heat pumps, or other products. 79 FR 38130, 38149 (July 3, 2014). 
As mentioned in section III.A of this document, DOE has previously 
determined that SEER2 and HSPF2 capture a representative measure of CAC 
and heat pump performance, including fan energy consumption, during 
heating and cooling operations, and that the test method for 
determining these metrics is provided in appendix M1. (See, for 
example, discussion of appendix M1 amendments at 82 FR 1426, 1446-1460 
(Jan. 5, 2017)) Therefore, DOE has not established standards covering 
such products. (42 U.S.C. 6295(o)(3)) Additionally, any products that 
are non-ducted or that do not move air through ductwork (e.g., draft 
inducer fans) would not meet the definition of a furnace fan and are, 
therefore, out of scope of the existing regulations.
    When evaluating and establishing or amending energy conservation 
standards, DOE may establish separate standards for a group of covered 
products (i.e., establish a separate product class) if DOE determines 
that separate standards are justified based on the type of energy used, 
or if DOE determines that the product has a capacity or other 
performance-related feature which other products within such type (or 
class) do not have and such feature justifies a different standard. (42 
U.S.C. 6295(q)) In making a determination whether a performance-related 
feature justifies a different standard, DOE considers such factors as 
the utility of the feature to the consumer and other factors DOE 
determines are appropriate. (Id.)
    In its regulations at 10 CFR 430.32(y), DOE currently categorizes 
furnace fans into 10 product classes, as presented in Table IV.1. In 
the proposed determination, DOE maintained these 10 classes, with the 
exception of a change to the mobile home non-weatherized oil furnace 
fan (``MH-NWO'') class discussed later in this section. 88 FR 69826, 
69833 (Oct. 6, 2023).

        Table IV.1--Current Consumer Furnace Fan Product Classes
------------------------------------------------------------------------
                              Product class
-------------------------------------------------------------------------
Non-Weatherized, Non-Condensing Gas Furnace Fan (``NWG-NC'').
Non-Weatherized, Condensing Gas Furnace Fan (``NWG-C'').
Weatherized Non-Condensing Gas Furnace Fan (``WG-NC'').
Non-Weatherized, Non-Condensing Oil Furnace Fan (``NWO-NC'').
Non-Weatherized Electric Furnace/Modular Blower Fan (``NWEF/NWMB'').
Mobile Home Non-Weatherized, Non-condensing Gas Furnace Fan (``MH-NWG-
 NC'').
Mobile Home Non-Weatherized, Condensing Gas Furnace Fan (``MH-NWG-C'').
Mobile Home Electric Furnace/Modular Blower Fan (``MH-EF/MB'').
Mobile Home Non-Weatherized Oil Furnace Fan (``MH-NWO'').*
Mobile Home Weatherized Gas Furnace Fan (``MH-WG'').*
------------------------------------------------------------------------
* DOE created the MH-NWO and MH-MG product classes in the July 2014
  Final Rule, but these classes do not currently have energy
  conservation standards.

    As directed by EPCA and as previously noted, DOE must specify a 
different standard level for a type or class of products that has the 
same function or intended use if DOE determines that products within 
such group: (A) consume a different kind of energy from that consumed 
by other covered products within such type (or class), or (B) have a 
capacity or other performance-related feature that other products 
within such type (or class) do not have and such feature justifies a 
higher or lower standard. (42 U.S.C. 6295(q)(1)) As shown in Table 
IV.1, there are four determinants of product class for consumer furnace 
fans: (1) whether the associated furnace is non-weatherized or 
weatherized; (2) whether the associated furnace uses condensing or non-
condensing technology; (3) whether or not the associated furnace is 
designed for use in a mobile home, and (4) the type of fuel used by the 
associated furnace. DOE's adoption of product classes for condensing 
and non-condensing furnace fans is discussed in the July 3, 2014 
Furnace Fans ECS Final Rule and the December 18, 2023 Furnaces ECS 
Final Rule published in the Federal Register at 79 FR 38130, 38149-
38150 and 88 FR 87502, 87537, respectively.
    In the July 2014 Final Rule, DOE created product classes for MH-NWO 
furnace fans and MH-WG furnace fans, but DOE did not analyze or 
prescribe standards for either product class because of the lack of 
available data for those product classes. 79 FR 38130, 38150 (July 3, 
2014). DOE is not aware of any products that would be considered MH-WG 
furnace fans at this time. However, DOE has become aware of a limited 
number of MH-NWO furnace fans that have been introduced to the market. 
The MH-NWO furnace fans that DOE identified are all used in non-
condensing furnaces, so DOE analyzed a subset of the previously 
established but unanalyzed class--mobile home non-weatherized, oil, 
non-condensing (``MH-NWO-NC'') furnace fans. As DOE is not aware of any 
condensing MH-NWO products, DOE did not analyze them for this final 
determination analysis and instead focused on MH-NWO-NC furnace fans.
    In this final determination, DOE maintained the product classes 
considered in the October 2023 NOPD, including consideration of only 
non-condensing MH-NWO products. DOE did not consider condensing MH-NWO 
or MH-WG products because, as noted in the previous paragraph, DOE has 
not

[[Page 83998]]

found any such products available on the market. Further, as discussed 
in the October 2023 NOPD, DOE concluded that it would be premature to 
analyze energy conservation standards for NWO-C and WG-C furnace fans 
at this time as DOE is only aware of a very small number of products on 
the market. 88 FR 69826, 69833. (Oct. 6, 2023) Therefore, DOE did not 
analyze the NWO-C and WG-C product classes for this final 
determination. DOE considered the product classes shown in the 
following list in its analysis:

(1) NWG-NC
(2) NWG-C
(3) MH-NWG-NC
(4) MH-NWG-C
(5) MH-EF/MB
(6) NWO-NC
(7) WG-NC
(8) NWEF/NWMB
(9) MH-NWO-NC

    In the case where a covered product has numerous product classes, 
DOE identifies and selects certain product classes as most 
representative and concentrates its analytical effort on those classes.
2. Technology Options
    DOE develops information in the technology assessment that 
characterizes the technologies and design options that manufacturers 
may use to attain higher-efficiency performance.
    In the October 2023 NOPD, DOE identified several technology options 
that would be expected to improve the efficiency of consumer furnace 
fans, in terms of FER as measured by the DOE test procedure. 88 FR 
69826, 69833 (Oct. 6, 2023). To develop a list of technology options, 
DOE identified possible technology options for improving furnace fan 
efficiency and examined the most common efficiency-improving 
technologies used in consumer furnace fans today. These technology 
options provide insight into the technological improvements typically 
used to increase the energy efficiency of consumer furnace fans.
    For this final determination, DOE has reviewed the consumer furnace 
fans market and confirmed that the technology options identified in the 
October 2023 NOPD continue to reflect the market. The identified 
technology options are shown in Table IV.2.

                 Table IV.2--List of Technology Options Considered for This Final Determination
----------------------------------------------------------------------------------------------------------------
                      Technology option                                           Description
----------------------------------------------------------------------------------------------------------------
Housing design modifications................................  Optimizing the shape and orientation of the
                                                               housing of a furnace fan can improve fan
                                                               efficiency. This can be accomplished by: (1)
                                                               optimizing the shape of the inlet cone, (2)
                                                               optimizing the fan housing shape, (3) optimizing
                                                               the motor mount and the motor location, (4)
                                                               minimizing the gaps between the impeller and the
                                                               inlet cone, and (5) optimizing cut-off location
                                                               and the manufacturing tolerances.
Multi-stage heating components and controls.................  Multi-stage or modulating heating allows furnaces
                                                               to meet heating load requirements more precisely
                                                               and can run at a low output when less heat is
                                                               required. Due to the cubic relationship between
                                                               fan input power and airflow, operating at the
                                                               reduced airflow-control setting may reduce
                                                               overall fan electrical energy consumption for
                                                               heating despite the extended hours.
Airflow path design.........................................  Modifications to the design and configuration of
                                                               elements in the airflow path, such as the heat
                                                               exchanger, could reduce internal static pressure.
                                                               Reduced internal static pressure levels result in
                                                               lower expected energy consumption levels.
Constant-torque BPM (``CT-BPM'') and constant-airflow BPM     Furnace fan manufacturers typically use either a
 (``CA-BPM'') motors.                                          permanent split capacitor (``PSC'') motor or a
                                                               more efficient BPM motor. PSC motors are a type
                                                               of induction motor where the stator is an
                                                               electromagnet that consists of electrical wire
                                                               windings, and BPM motors are three-phase
                                                               permanent magnet motors.
Inverter controls for PSC motors............................  Using an inverter, the incoming alternating
                                                               current (``AC'') is converted to DC current by a
                                                               rectifier and then back to AC current at a
                                                               specific frequency. The output AC current is used
                                                               to drive the motor, the operating speed of which
                                                               depends on the frequency of the AC current. This
                                                               allows PSC motors with inverter controls to
                                                               better match demand.
Higher-efficiency fan blades................................  Furnace fans typically use an impeller to move air
                                                               through ductwork. Energy savings may be possible
                                                               by using backward-inclined impellers. These
                                                               impellers incorporate backward-facing inclined
                                                               blades that are generally wider in the airflow
                                                               direction across the blade as compared with
                                                               forward-curved impellers.
----------------------------------------------------------------------------------------------------------------

    In response to the October 2023 NOPD, the Joint Advocates stated 
that more-efficient BPM motors are a technology option that can be used 
to improve FER but were not considered as an efficiency level in DOE's 
analysis. (Joint Advocates, No. 31 at p. 3) Lennox commented that the 
feasible technologies available for furnace fans considered by the NOPD 
have not changed since the last furnace fan standards rulemaking in 
2014, which adopted the current standards that took effect in 2019. 
(Lennox, No. 30 at pp. 1-3)
    In response, DOE notes that BPM motor manufacturers do not 
currently disclose the efficiency of their motors. Further, as 
discussed in the October 2023 NOPD, DOE is not aware of any data 
showing the relationship between improved BPM motor efficiency and FER 
ratings. In the October 2023 NOPD, DOE requested data regarding this 
relationship and stated that it may include efficiency levels 
corresponding to the use of more-efficient BPM motors in a future 
analysis, but DOE did not include this additional efficiency level in 
the October 2023 analysis, due to the lack of data. 88 FR 69826, 69840 
(Oct. 6, 2023). For this final determination, although DOE did continue 
to analyze use of BPM motors, DOE similarly did not include an analysis 
of more-efficient BPM motors as a technology option, due to lack of 
data about BPM motors that are more efficient than those analyzed by 
DOE. DOE's analysis of BPM motors as a technology for improving FER 
ratings is discussed further in section IV.B.1 of this document.
3. Impact From Other Rulemakings
    In response to the October 2023 NOPD, Lennox commented that the 
significant cumulative regulatory burden on furnace manufacturers 
furthers the case that adopting a ``no-new-standard'' for furnace fans 
is warranted. The commenter added that there are a variety of Federal 
and State regulations being implemented that impact furnace 
manufacturers, including the EPA Technology Transition Final Rule to 
lower global warming potential (``GWP'') refrigerants,

[[Page 83999]]

EPA Refrigerant Management NOPR, DOE energy conservation standards 
(``ECS'') Furnace Standards rulemaking, National and Regional Cold 
Climate Heat Pump Specifications, DOE ECS for Three-Phase Central Air 
Conditioners and Heat Pumps below 65,000 Btu/h, DOE Test Procedure for 
Variable Refrigerant Flow (``VRF'') Systems, DOE Walk-in Cooler and 
Freezer Test Procedure, and DOE Walk-in Cooler and Freezer ECS NOPR. 
(Lennox, No. 30 at p. 3) Lennox emphasized that Federal and State 
refrigerant regulations are consuming nearly all of manufacturers' 
testing, laboratory, and product development resources. (Id.) AHRI 
commented that the furnace industry will be significantly impacted by 
the amended energy conservation standards for non-weatherized gas-fired 
furnaces, and DOE should consider this burden when assessing the 
manufacturer impact on this rule.\9\ (AHRI, No. 32 at pp. 1-2) The 
commenter further stated that the U.S. Consumer Product Safety 
Commission (``CPSC'') published a NOPR in the Federal Register on 
October 25, 2023, in which it proposed to require that all consumer 
gas-fired furnaces and boilers must continuously monitor the production 
of carbon monoxide (``CO'') during the combustion process and modulate 
or shut down the furnace at certain carbon monoxide levels (see 88 FR 
73272). AHRI commented that CPSC's proposal would have a significant 
impact on the furnace industry, and DOE should consider CPSC's proposal 
when assessing manufacturer impacts of this current rulemaking. (Id. at 
p. 2)
---------------------------------------------------------------------------

    \9\ At the time of AHRI's comment, DOE had issued a pre-
publication copy of the final rule amending the standards for 
consumer non-weatherized gas furnaces and mobile home gas furnaces. 
That final rule was ultimately published in the Federal Register on 
December 18, 2023. 88 FR 87502.
---------------------------------------------------------------------------

    In response, DOE notes that the Department is not amending the 
energy conservation standards for consumer furnace fans, and, 
therefore, it does not expect this rulemaking to contribute to the 
cumulative regulatory burden of manufacturers.
4. Screening Analysis
    As discussed, DOE conducts a screening analysis to evaluate whether 
to further consider each identified technology and design option. DOE 
uses the following five screening criteria to determine which 
technology options are suitable for further consideration in an energy 
conservation standards rulemaking:
    (1) Technological feasibility. Technologies that are not 
incorporated in commercially-available products or in commercially-
viable, existing prototypes will not be considered further.
    (2) Practicability to manufacture, install, and service. If it is 
determined that mass production of a technology in commercially-
available products and reliable installation and servicing of the 
technology could not be achieved on the scale necessary to serve the 
relevant market at the time of the projected compliance date of the 
standard, then that technology will not be considered further.
    (3) Impacts on product utility. If a technology is determined to 
have a significant adverse impact on the utility of the product to 
subgroups of consumers or results in the unavailability of any covered 
product type with performance characteristics (including reliability), 
features, sizes, capacities, and volumes that are substantially the 
same as products generally available in the United States at the time, 
it will not be considered further.
    (4) Safety of technologies. If it is determined that a technology 
would have significant adverse impacts on health or safety, it will not 
be considered further.
    (5) Unique-pathway proprietary technologies. If a technology has 
proprietary protection and represents a unique pathway to achieving a 
given efficiency level, it will not be considered further, due to the 
potential for monopolistic concerns.
    See 10 CFR part 430, subpart C, appendix A, sections 6(a)(3)(iii) 
and 7(b).
    If DOE determines that a technology fails to meet one or more of 
these listed criteria, it is excluded from further consideration in the 
engineering analysis. The following sections include comments from 
interested parties pertinent to the screening analysis and DOE's 
evaluation of each technology option against the screening analysis 
criteria.
a. Screened-Out Technologies
    In the October 2023 NOPD, DOE tentatively screened out housing 
design modifications and changes to airflow path designs from its 
analysis. 88 FR 69826, 69835-69836 (Oct. 6, 2023). As discussed in 
section IV.A.2 of this document, airflow path and fan housing 
improvements can improve furnace fan efficiencies. However, as 
initially discussed in chapter 4 of the November 2022 Preliminary 
Analysis TSD, DOE does not have data to quantify the impact of housing 
design modifications or airflow path design on FER. Additionally, DOE 
has found that the housing design modifications and airflow path design 
can impact the performance of the furnace efficiency as measured in 
AFUE. Although housing design modifications and changes to the airflow 
path design have the potential to reduce FER, DOE currently lacks the 
data necessary to conclude that these options will not reduce utility 
to consumers (e.g., by reducing the AFUE), and, therefore, the 
Department has continued to screen out these technologies for this 
analysis. DOE did not receive any comments on the screening of these 
technologies in response to the October 2023 NOPD.
    Based on DOE's research, DOE screened out the technology options on 
the basis of each of the screening criteria shown in Table IV.3 from 
further consideration as options to improve the FER (as measured by the 
DOE test procedure) of consumer furnace fans. The reasons for exclusion 
associated with each technology are marked in the table with an ``X.''

                                                       Table IV.3--Technology Options Screened Out
--------------------------------------------------------------------------------------------------------------------------------------------------------
                                                                                   Screening criteria (X = basis for screening out)
                                                            --------------------------------------------------------------------------------------------
                                                                               Practicability to      Impacts on
                     Technology option                        Technological        install,         product utility   Adverse impacts    Unique-pathway
                                                               feasibility     manufacture, and       or product        on health or       proprietary
                                                                                    service          availability          safety         technologies
--------------------------------------------------------------------------------------------------------------------------------------------------------
Housing Design Modifications...............................  ..............  ....................                 X  .................  ................
Airflow Path Design........................................  ..............  ....................                 X  .................  ................
--------------------------------------------------------------------------------------------------------------------------------------------------------


[[Page 84000]]

b. Remaining Technologies
    After a thorough review of each technology, DOE concludes that all 
of the remaining identified technologies not ``screened out'' meet all 
of the screening criteria. In summary, DOE retained (i.e., did not 
screen out) the technology options listed below:
    <bullet> Multi-stage heating components and controls;
    <bullet> High-efficiency fan motors;
    <bullet> Inverter controls for PSC motors, and
    <bullet> Higher-efficiency fan blades.
    DOE determined that these technology options are technologically 
feasible because they are being used or have previously been used in 
commercially-available products or working prototypes. DOE also finds 
that all of the remaining technology options meet the other screening 
criteria (i.e., practicable to manufacture/install/service; do not 
result in adverse impacts on product utility, product availability, 
health, or safety; and do not utilize unique-pathway proprietary 
technologies). DOE considers these remaining technology options as the 
basis for higher efficiency levels that DOE could consider for 
potential amended standards.
    In response to the October 2023 NOPD, Lennox commented that 
backward-inclined impellers do not guarantee efficiency improvements 
for furnace fans. The commenter stated that there is a limited number 
of backward-inclined impellers on the market and expressed concern 
about the feasibility of implementing this technology option across all 
input capacities and cabinet sizes, which could lead to the 
unavailability of certain furnace product sizes. Consequently, Lennox 
recommended that this technology should not form the basis for more-
stringent furnace fan standards. (Lennox, No. 30 at p. 2)
    As discussed in the October 2023 NOPD, even if there are only a 
limited number of commercially-available product designs that 
incorporate backward-inclined impellers, they are sufficient to 
demonstrate technological feasibility, as required by EPCA and 
clarified in DOE's regulations at 10 CFR part 430, subpart C, appendix 
A, section 7(b)(1). 88 FR 69826, 69836 (Oct. 6, 2023). Further, DOE is 
aware of backward-inclined impellers that have been safely and reliably 
implemented in consumer furnace fan models currently available on the 
market and that reduce the FER of those units. Thus, DOE finds that 
backward-inclined impellers pass the screening analysis and 
consequently are suitable for further consideration. However, DOE 
acknowledges that there may be additional challenges associated with 
backward-inclined impellers, and these issues are discussed further in 
section IV.H of this document.

B. Engineering and Cost Analysis

    The purpose of the engineering analysis is to establish the 
relationship between the efficiency and manufacturer production cost 
(``MPC'') of the subject product (i.e., consumer furnace fans). There 
are two elements to consider in the engineering analysis: (1) the 
selection of efficiency levels to analyze (i.e., the ``efficiency 
analysis''), and (2) the determination of product cost at each 
efficiency level (i.e., the ``cost analysis''). In determining the 
performance of higher-efficiency products, DOE considers those 
technologies and design option combinations not eliminated by the 
screening analysis. For each product class, DOE estimates the baseline 
cost, as well as the incremental cost for the product at efficiency 
levels above the baseline. The output of the engineering analysis is a 
set of cost-efficiency ``curves'' that are used in downstream analyses 
(i.e., the LCC and PBP analyses and the NIA).
    DOE recently conducted an engineering analysis to determine the 
cost-efficiency relationship for furnace fans for the October 2023 
NOPD. 88 FR 69826, 69837-69849 (Oct. 6, 2023). For this final 
determination, DOE reviewed market data collected as part of the market 
and technology assessment (see section IV.A of this document) and has 
determined that consumer furnace fan efficiencies have not changed 
substantially since the October 2023 NOPD analysis. Thus, as discussed 
in section IV.B.1 of this document, DOE maintained the efficiency 
levels from the October 2023 NOPD in the final determination analysis. 
Additionally, DOE examined its most recent inputs to its manufacturing 
cost analysis (e.g., raw material prices, component prices, labor 
rates) and found that, while underlying manufacturing costs inputs have 
increased, the resulting manufacturing cost increases would be nearly 
proportional at each efficiency level. In other words, the incremental 
increase in cost to achieve each efficiency level would be 
approximately the same as was presented in the October 2023 NOPD 
analysis. Because incremental cost increases at efficiency levels above 
the baseline would not change significantly, DOE concludes that an 
updated cost analysis would not impact the results of this final 
determination. Therefore, as discussed in sections IV.B.2 and IV.B.3 of 
this document, DOE used the same cost analysis methodology as the 
October 2023 NOPD, and the resulting cost-efficiency relationships used 
for this final determination are the same as the October 2023 NOPD. 
Further information on this analytical methodology is presented in the 
following subsections.
1. Efficiency Analysis
    DOE typically uses one of two approaches to develop energy 
efficiency levels for the engineering analysis: (1) relying on observed 
efficiency levels in the market (i.e., the efficiency-level approach), 
or (2) determining the incremental efficiency improvements associated 
with incorporating specific design options to a baseline model (i.e., 
the design-option approach). Using the efficiency-level approach, the 
efficiency levels established for the analysis are determined based on 
the market distribution of existing products (in other words, based on 
the range of efficiencies and efficiency-level ``clusters'' that 
already exist on the market). Using the design-option approach, the 
efficiency levels established for the analysis are determined through 
detailed engineering calculations and/or computer simulations of the 
efficiency improvements from implementing specific design options that 
have been identified in the technology assessment. DOE may also rely on 
a combination of these two approaches. For example, the efficiency-
level approach (based on actual products on the market) may be extended 
using the design-option approach to interpolate to define ``gap fill'' 
levels (to bridge large gaps between other identified efficiency 
levels) and/or to extrapolate to the ``max-tech'' level (particularly 
in cases where the ``max-tech'' level exceeds the maximum efficiency 
level currently available on the market).
    Although FER data exist in DOE's Compliance Certification Database 
(``CCD'') for furnace fans currently subject to efficiency standards, 
DOE has determined through testing that for many furnace fan models, 
the rated FER values may not be representative of the model's actual 
performance. During confidential manufacturer interviews, several 
manufacturers confirmed that they rate the FER of their furnace fan 
products conservatively. Therefore, an efficiency-level approach was 
not possible because the FER ratings of products currently available 
are largely not representative of their actual performance. Thus, DOE 
chose a design-option approach to identify efficiency

[[Page 84001]]

levels for the analysis in this final determination.
a. Baseline Efficiency
    For each product class, DOE generally selects a baseline model as a 
reference point for each class, and measures anticipated changes to the 
product resulting from potential energy conservation standards against 
the baseline model. The baseline model in each product class represents 
the characteristics of products typical of that class (e.g., capacity, 
physical size). Generally, a baseline model is one that just meets 
current energy conservation standards, or, if no standards are in 
place, the baseline is typically the most-common or least-efficient 
unit on the market. For consumer furnace fans, the energy conservation 
standard sets a maximum energy usage requirement, and, therefore, a 
baseline furnace fan's rated FER is just below or at the maximum FER 
threshold.
    DOE used baseline units for comparison in several analyses, 
including the engineering analysis, LCC analysis, PBP analysis, and 
NIA. To determine energy savings that will result from an amended 
energy conservation standard, DOE compared energy use at each of the 
higher efficiency levels to the energy consumption of the baseline 
unit. Similarly, to determine the changes in price to the consumer that 
will result from an amended energy conservation standard, DOE compared 
the prices of baseline units to the prices of units at each higher 
efficiency level.
    The identification of baseline units requires establishing the 
baseline efficiency level. In cases where there is an existing 
standard, DOE defines ``baseline units'' as units with efficiencies 
equal to the current Federal energy conservation standards. For the MH-
NWO-NC furnace fan product class, which does not currently have energy 
conservation standards, DOE developed the baseline equation by 
modifying the current energy conservation standards for the NWO-NC 
product class to account for the lower ESP experienced by mobile home 
units compared to other units. Specifically, DOE multiplied the y-
intercept (382) by 0.75, which was the conversion factor determined in 
the analysis for the July 2014 Final Rule that was previously used to 
calculate the MH-NWG-NC baseline based on the NWG-NC baseline.\10\
---------------------------------------------------------------------------

    \10\ Chapter 5 of the TSD accompanying the July 2014 Final Rule 
includes additional details about how this conversion factor was 
calculated. See docket no. EERE-2010-BT-STD-0011.
---------------------------------------------------------------------------

    In the October 2023 NOPD, DOE used the current energy conservation 
standards for consumer furnace fans and the developed equation for MH-
NWO-NC furnace fans, presented in Table IV.4, as the baseline FER 
efficiency level for each consumer furnace fan product class, along 
with the typical characteristics of a baseline unit.

           Table IV.4--Baseline Efficiency Levels and Associated Design Options for Each Product Class
----------------------------------------------------------------------------------------------------------------
              Product class                               Maximum FER                        Design option
----------------------------------------------------------------------------------------------------------------
Non-weatherized, non-condensing gas       0.044 * QMax + 182........................  BPM motor w/forward-
 furnace fan.                                                                          inclined impeller.
Non-weatherized, condensing gas furnace   0.044 * QMax + 195........................  BPM motor w/forward-
 fan.                                                                                  inclined impeller.
Weatherized, non-condensing gas furnace   0.044 * QMax + 199........................  BPM motor w/forward-
 fan.                                                                                  inclined impeller.
Non-weatherized, non-condensing oil       0.071 * QMax + 382........................  Improved PSC motor w/
 furnace fan.                                                                          forward-inclined
                                                                                       impeller.
Non-weatherized electric furnace fan/     0.044 * QMax + 165........................  BPM motor w/forward-
 modular blower fan.                                                                   inclined impeller.
Manufactured home, non-weatherized, non-  0.071 * QMax + 222........................  Improved PSC motor w/
 condensing gas furnace fan.                                                           forward-inclined
                                                                                       impeller.
Manufactured home, non-weatherized,       0.071 * QMax + 240........................  Improved PSC motor w/
 condensing gas furnace fan.                                                           forward-inclined
                                                                                       impeller.
Manufactured home, non-weatherized        0.044 * QMax + 101........................  BPM motor w/forward-
 electric furnace fan/modular blower fan.                                              inclined impeller.
Manufactured home, non-weatherized, non-  0.071 * QMax + 287........................  Improved PSC motor w/
 condensing oil furnace fan.                                                           forward-inclined
                                                                                       impeller.
----------------------------------------------------------------------------------------------------------------

    Products in the NWG-NC, NWG-C, WG-NC, NWEF/NWMB, and MH-EF/MB 
product classes are currently subject to the standards set in the July 
2014 Final Rule, in which the efficiency levels adopted were understood 
at that time to reflect models with CT-BPM motors and multi-stage 
operation. Products in the NWO-NC and MH-NWG-NC product classes are 
currently subject to standards set in the July 2014 Final Rule, in 
which the efficiency levels adopted were understood to correspond to 
the performance associated with models including improved PSC motors 
and single-stage operation. Baseline products in the MH-NWO-NC product 
class were also found to correspond to performance associated with 
models including improved PSC motors and single-stage operation, based 
on DOE's market findings for mobile home oil-fired units certified in 
DOE's CCD for consumer furnaces.
    Many furnaces include multi-stage or modulating heating controls. 
However, based on current furnace fan market data, as well as feedback 
received during manufacturer interviews, it is unclear if these 
features impact furnace fan efficiency as measured by FER (see section 
IV.A.2 of this document). Therefore, DOE did not include the costs of 
multi-stage or modulating heating controls in the baseline design 
(i.e., DOE's MPC estimates reflect single-stage units). However, DOE 
did develop separate cost values for multi-stage or modulating heating 
controls that can be applied to the above costs to represent the 
addition of multi-stage or modulating heating controls (see section 
IV.B.2.b of this document). These additional cost values are used in 
DOE's LCC and PBP analyses in order to represent typical furnace fan 
cost distributions.
    In addition, the baseline motor technology is either BPM or PSC, 
depending on the product class. Manufacturers may choose a CA-BPM motor 
instead of a CT-BPM, despite its relatively higher cost, to add 
comfort-related benefits to their product. This additional comfort may 
be marketed as a premium feature. Therefore, DOE included the cost of a 
CT-BPM motor in the MPCs for furnace fans with BPM motors. DOE also 
developed cost values to represent the cost increase for CA-BPM motors 
relative to CT-BPM motors (see section IV.B.2.b of this document). 
These values were applied in the LCC

[[Page 84002]]

analysis to represent the distribution of BPM blower motor technologies 
expected on the market because, although DOE is not differentiating 
between CA-BPM motors and CT-BPM motors in terms of furnace fan 
efficiency, manufacturers and consumers may consider CA-BPM motors to 
be a premium feature that may offer comfort-related consumer benefits.
    In developing the cost-efficiency relationship, teardowns of 
baseline units were used as a reference point for determining the cost-
efficiency relationship of units with lower (more efficient) FERs. DOE 
compared the design features incorporated into products at the baseline 
efficiency to the features of units with higher energy efficiencies in 
order to determine the changes in manufacturing, installation, and 
operating costs that occur as FER decreases.
    DOE did not receive comments in response to the baseline efficiency 
levels used in the October 2023 NOPD. Therefore, for this final 
determination, DOE used the baseline efficiency levels as presented in 
the October 2023 NOPD.
b. Intermediate Efficiency Levels
    As noted, EPCA requires that any new or amended energy conservation 
standard be designed to achieve the maximum improvement in energy 
efficiency that is technologically feasible and economically justified. 
(42 U.S.C. 6295(o)(2)(A))
    In the October 2023 NOPD, DOE analyzed intermediate efficiency 
levels for NWO-NC, MH-NWG-NC, MH-NWG-C, and MH-NWO-NC classes of 
consumer furnace fans. 88 FR 69826, 69840 (Oct. 6, 2023). As discussed 
in section IV.B.1.c of this document, DOE did not identify any 
efficiency levels between baseline and max-tech for the NWG-NC, NWG-C, 
WG-NC, NWEF/NWMB, and MH-EF/MB classes. The intermediate efficiency 
levels identified are representative of efficiency levels where major 
technological changes occur (i.e., replacing PSC motors with BPM 
motors). As discussed in section IV.B.1.a of this document, DOE has 
found that CT-BPM motors and CA-BPM motors have comparable impacts on 
FER ratings, and DOE has, therefore, only analyzed a single efficiency 
level reflecting the implementation of BPM motors. In the 2014 Final 
Rule (79 FR 38130, 38159), DOE used the assumption of a 12-percent 
reduction in FER for improved PSC motors and a 46-percent reduction in 
FER for models with a CT-BPM and multi-staging from the baseline to 
calculate a 39-percent reduction in FER from improved PSC (the current 
baseline) to CT-BPM with multi-staging. The 39-percent reduction in FER 
is implemented into the current analysis to represent the reduction in 
FER from improved PSC to a model with a CT-BPM (regardless of staging) 
because DOE decided not to include staging as a technology option that 
improves FER.
    In commenting on the October 2023 NOPD, the Joint Advocates 
recommended that DOE gather additional information about BPM motor 
efficiency and analyze an efficiency level with improved (i.e., higher-
efficiency) BPM motors. The Joint Advocates commented that, based on 
conversations with motor manufacturers, more-efficient BPM motors exist 
in the furnace fan market and would improve furnace fan efficiency. 
(Joint Advocates, No. 31 at p. 3)
    In response, as discussed in section IV.A.2 of this document, DOE 
does not currently have the data necessary to determine the 
relationship between improved BPM motor efficiency and furnace fan 
efficiency. Therefore, although DOE continued to analyze BPM motors as 
a technology that improves FER, the Department did not analyze an 
efficiency level based on improved BPM motor efficiency (relative to 
the BPM motor efficiency identified in the October 2023 NOPD) for this 
final determination.
c. Maximum Technology (``Max-Tech'') Efficiency Levels
    As part of its analysis, DOE identifies the ``maximum available'' 
efficiency level, representing the highest-efficiency unit currently 
available on the market. DOE also defines a ``max-tech'' efficiency 
level, representing the maximum theoretical efficiency that can be 
achieved through the application of all available technology options 
retained from the screening analysis. In many cases, the max-tech 
efficiency level is not commercially available because it is not 
currently economically feasible.
    In the October 2023 NOPD, DOE identified the max-tech design for 
all consumer furnace fan product types as incorporating a BPM motor and 
a backward-inclined impeller. 88 FR 69826, 69840 (Oct. 6, 2023). BPM 
motors are described in sections IV.B.1.a and IV.B.1.b of this 
document. For furnace fan models that use PSC motors, BPM motors can 
offer an improvement in efficiency and reduce FER. Backward-inclined 
impellers, in comparison to forward-inclined impellers (which are used 
in the majority of furnace fans on the market), have been found to have 
a higher efficiency under certain operating conditions. DOE has used 
the same assumptions about the percent reduction in FER associated with 
implementing backward-inclined impellers as in the July 2014 Final Rule 
(i.e., a 10-percent reduction in FER compared to models that include 
forward-inclined impellers). 79 FR 38130, 38159 (July 3, 2014).
    In response to the October 2023 NOPD, the Joint Advocates 
encouraged DOE to investigate the most efficient furnace fans currently 
available on the market that exceed DOE's max-tech level. The 
commenters argued that there are many furnace fan models across a range 
of airflows in the major product classes that are more efficient than 
EL 1. The Joint Advocates added that there are many NWG-C furnace fans 
in the CCD that exceed the max-tech level by more than 10 percent and 
do not appear to use backward-inclined impeller technology. The Joint 
Advocates further stated it is unlikely that the CCD overstates the 
efficiencies of these fans, as they are often rated conservatively. 
(Joint Advocates, No. 31 at p. 2)
    In response, DOE assessed the furnace fan entries in the CCD that 
are rated at a lower FER than would be required by the max-tech 
efficiency level and found that these fans used a variety of motor 
technologies, staging technologies, and controls. DOE was unable to 
identify a design option that captured the technologies used in these 
units to develop an additional efficiency level. DOE notes that 
technologies such as housing design modifications and airflow design 
paths could allow the identified furnace fans to achieve FER ratings 
below those prescribed by the max-tech efficiency levels. However, as 
discussed in section IV.A.4 of this document, these technology options 
were screened out due to adverse impacts on product utility. Therefore, 
for this final determination, DOE concludes that the max-tech 
efficiency levels, as presented in the October 2023 NOPD, accurately 
reflect the maximum possible efficiency levels using the technology 
options remaining after the screening analysis.
d. Summary of Efficiency Levels Analyzed
    The FER efficiency levels and associated technologies expected to 
be used to increase energy efficiency above the baseline levels for 
each class of consumer furnace fans are presented in Table IV.5 through 
Table IV.13, respectively.

[[Page 84003]]



          Table IV.5--Efficiency Levels and Technologies Used at Each Efficiency Level for NWG-NC Fans
----------------------------------------------------------------------------------------------------------------
                                                                         Description of           Percentage
                  EL                           FER equation          technologies typically    reduction in FER
                                                                          incorporated           from baseline
----------------------------------------------------------------------------------------------------------------
0--Baseline...........................  0.044 * QMax + 182.......  BPM motor w/forward-                      N/A
                                                                    curved impeller.
1--Max-tech...........................  0.04 * QMax + 164........  BPM motor w/backward-                      10
                                                                    inclined impeller.
----------------------------------------------------------------------------------------------------------------


           Table IV.6--Efficiency Levels and Technologies Used at Each Efficiency Level for NWG-C Fans
----------------------------------------------------------------------------------------------------------------
                                                                         Description of           Percentage
                  EL                           FER equation          technologies typically    reduction in FER
                                                                          incorporated           from baseline
----------------------------------------------------------------------------------------------------------------
0--Baseline...........................  0.044 * QMax + 195.......  BPM motor w/forward-                      N/A
                                                                    curved impeller.
1--Max-tech...........................  0.04 * QMax + 176........  BPM motor w/backward-                      10
                                                                    inclined impeller.
----------------------------------------------------------------------------------------------------------------


           Table IV.7--Efficiency Levels and Technologies Used at Each Efficiency Level for WG-NC Fans
----------------------------------------------------------------------------------------------------------------
                                                                         Description of           Percentage
                  EL                           FER equation          technologies typically    reduction in FER
                                                                          incorporated           from baseline
----------------------------------------------------------------------------------------------------------------
0--Baseline...........................  0.044 * QMax + 199.......  BPM motor w/forward-                      N/A
                                                                    curved impeller.
1--Max-tech...........................  0.04 * QMax + 179........  BPM motor w/backward-                      10
                                                                    inclined impeller.
----------------------------------------------------------------------------------------------------------------


         Table IV.8--Efficiency Levels and Technologies Used at Each Efficiency Level for NWEF/NWMB Fans
----------------------------------------------------------------------------------------------------------------
                                                                         Description of           Percentage
                  EL                           FER equation          technologies typically    reduction in FER
                                                                          incorporated           from baseline
----------------------------------------------------------------------------------------------------------------
0--Baseline...........................  0.044 * QMax + 165.......  BPM motor w/forward-                      N/A
                                                                    curved impeller.
1--Max-tech...........................  0.04 * QMax + 149........  BPM motor w/backward-                      10
                                                                    inclined impeller.
----------------------------------------------------------------------------------------------------------------


         Table IV.9--Efficiency Levels and Technologies Used at Each Efficiency Level for MH-EF/MB Fans
----------------------------------------------------------------------------------------------------------------
                                                                         Description of           Percentage
                  EL                           FER equation          technologies typically    reduction in FER
                                                                          incorporated           from baseline
----------------------------------------------------------------------------------------------------------------
0--Baseline...........................  0.044 * QMax + 101.......  BPM motor w/forward-                      N/A
                                                                    curved impeller.
1--Max-tech...........................  0.04 * QMax + 91.........  BPM motor w/backward-                      10
                                                                    inclined impeller.
----------------------------------------------------------------------------------------------------------------


        Table IV.10--Efficiency Levels and Technologies Used at Each Efficiency Level for MH-NWG-NC Fans
----------------------------------------------------------------------------------------------------------------
                                                                         Description of           Percentage
                  EL                           FER equation          technologies typically    reduction in FER
                                                                          incorporated           from baseline
----------------------------------------------------------------------------------------------------------------
0--Baseline...........................  0.071 * QMax + 222.......  Improved PSC motor.......                 N/A
1.....................................  0.044 * QMax + 137.......  BPM motor w/forward-                       39
                                                                    curved impeller.
2--Max-tech...........................  0.04 * QMax + 123........  BPM motor w/backward-                      45
                                                                    inclined impeller.
----------------------------------------------------------------------------------------------------------------


         Table IV.11--Efficiency Levels and Technologies Used at Each Efficiency Level for MH-NWG-C Fans
----------------------------------------------------------------------------------------------------------------
                                                                         Description of           Percentage
                  EL                           FER equation          technologies typically    reduction in FER
                                                                          incorporated           from baseline
----------------------------------------------------------------------------------------------------------------
0--Baseline...........................  0.071 * QMax + 240.......  Improved PSC motor.......                 N/A
1.....................................  0.044 * QMax + 148.......  BPM motor w/forward-                       39
                                                                    curved impeller.
2--Max-tech...........................  0.04 * QMax + 133........  BPM motor w/backward-                      45
                                                                    inclined impeller.
----------------------------------------------------------------------------------------------------------------


[[Page 84004]]


          Table IV.12--Efficiency Levels and Technologies Used at Each Efficiency Level for NWO-NC Fans
----------------------------------------------------------------------------------------------------------------
                                                                         Description of           Percentage
                  EL                           FER equation          technologies typically    reduction in FER
                                                                          incorporated           from baseline
----------------------------------------------------------------------------------------------------------------
0--Baseline...........................  0.071 * QMax + 382.......  Improved PSC motor.......                 N/A
1.....................................  0.044 * QMax + 236.......  BPM motor w/forward-                       39
                                                                    curved impeller.
2--Max-tech...........................  0.04 * QMax + 212........  BPM motor w/backward-                      45
                                                                    inclined impeller.
----------------------------------------------------------------------------------------------------------------


          Table IV.13--Efficiency Levels and Technologies Used at Each Efficiency Level MH-NWO-NC Fans
----------------------------------------------------------------------------------------------------------------
                                                                         Description of           Percentage
                  EL                           FER equation          technologies typically    reduction in FER
                                                                          incorporated           from baseline
----------------------------------------------------------------------------------------------------------------
0--Baseline...........................  0.071 * QMax + 287.......  Improved PSC motor.......                 N/A
1.....................................  0.044 * QMax + 176.......  BPM motor w/forward-                       39
                                                                    curved impeller.
2--Max-tech...........................  0.04 * QMax + 158........  BPM motor w/backward-                      45
                                                                    inclined impeller.
----------------------------------------------------------------------------------------------------------------

2. Cost Analysis
    The cost analysis portion of the engineering analysis is conducted 
using one or a combination of cost approaches. The selection of cost 
approach depends on a suite of factors, including the availability and 
reliability of public information, characteristics of the regulated 
product, and the availability and timeliness of purchasing the product 
on the market. The cost approaches generally used by DOE are summarized 
as follows:
    [ballot] Physical teardowns: Under this approach, DOE physically 
dismantles commercially-available products, component-by-component, to 
develop a detailed bill of materials for the products.
    [ballot] Catalog teardowns: In lieu of physically deconstructing 
products, DOE identifies each component using parts diagrams (available 
from manufacturer websites or appliance repair websites, for example) 
to develop the bill of materials for the product.
    [ballot] Price surveys: If neither a physical nor catalog teardown 
is feasible (e.g., for tightly integrated products such as fluorescent 
lamps, which are infeasible to disassemble and for which parts diagrams 
are unavailable), cost-prohibitive, or otherwise impractical (e.g., 
large commercial boilers), DOE conducts price surveys using publicly-
available pricing data published on major online retailer websites and/
or by soliciting prices from distributors and other commercial 
channels.
    In the October 2023 NOPD, DOE conducted the cost analysis using a 
combination of physical and catalog teardowns to assess how 
manufacturing costs change with increased product efficiency. 88 FR 
69826, 69844 (Oct. 6, 2023). DOE estimated the MPC associated with each 
efficiency level to characterize the cost-efficiency relationship of 
improving consumer furnace fan performance. The MPC estimates are not 
for the entire HVAC product. Because consumer furnace fans are a 
component of the HVAC product into which they are integrated, the MPC 
estimates include costs only for the components of the HVAC product 
that impact FER. Id.
    Products were selected for physical teardown analysis that have 
characteristics of typical products on the market near a representative 
input capacity of 80,000 Btu/h for the NWG-NC, NWG-C, WG-NC, NWEF/NWMB, 
MH-NWG-NC, MH-NWG-C, MH-EF/MB, and MH-WG product classes and 105,000 
Btu/h for the NWO-NC and MH-NWO-NC product classes (determined based on 
market data and discussions with manufacturers). Selections spanned a 
range of FER efficiency levels and designs and included most 
manufacturers. The resulting bill of materials provides the basis for 
the MPC estimates for products at various efficiency levels spanning 
the full range of efficiencies from the baseline to max-tech.
    To account for manufacturers' non-production costs and profit 
margin, DOE applies a non-production cost multiplier (the manufacturer 
markup) to the MPC. The resulting manufacturer selling price (``MSP'') 
is the price at which the manufacturer distributes a unit into 
commerce. DOE developed an average manufacturer markup by examining the 
annual Securities and Exchange Commission (``SEC'') 10-K reports filed 
by publicly-traded manufacturers primarily engaged in HVAC 
manufacturing and whose combined product range includes consumer 
furnace fans. DOE refined its understanding of manufacturer markups by 
using information obtained during manufacturer interviews. The 
manufacturer markups were used to convert the MPCs into MSPs. Further 
information on this analytical methodology is presented in the 
following subsections.
a. Teardown Analysis
    For the October 2023 NOPD, to assemble bills of materials 
(``BOMs'') and to calculate manufacturing costs for the different 
components in consumer furnace fans, multiple units were disassembled 
into their base components, and DOE estimated the materials, processes, 
and labor required to manufacture each individual component, a process 
referred to as a ``physical teardown.'' Using the data gathered from 
the physical teardowns, each component was characterized according to 
its weight, dimensions, material, quantity, and the manufacturing 
processes used to fabricate and assemble it.
    For supplementary catalog teardowns, product data were gathered, 
such as dimensions, weight, and design features from publicly-available 
information such as manufacturer catalogs. Such ``virtual teardowns'' 
allowed DOE to estimate the major physical differences between a 
product that was physically disassembled and a similar product that was 
not. For this final determination, data from a total of 61 physical and 
virtual teardowns of consumer furnace fans were used to calculate 
industry MPCs in the engineering analysis.
    The models selected for teardown in each product class represented 
manufacturers with large market shares in the product classes for which 
their teardown units are categorized. Whenever possible, DOE examined 
multiple models from a given manufacturer that capture different design 
options and used them as direct points of comparison. DOE examined

[[Page 84005]]

products with PSC, CT-BPM, and CA-BPM indoor blower motors, as well as 
products using single-stage, two-stage, and modulating combustion 
systems. As further discussed in section IV.B.2.b of this document, 
cost values were developed for some of these technologies to estimate 
the manufacturing cost of changing designs from one technology to 
another (i.e., using a CA-BPM instead of a CT-BPM, or two-stage 
combustion instead of single-stage combustion).
    As described in Chapter 5 of the November 2022 Preliminary Analysis 
TSD, DOE found that MPC did not differ significantly across product 
classes at a given efficiency level and given production volume because 
manufacturers use similar components. Therefore, in this analysis, DOE 
used teardowns of non-weatherized gas and mobile home gas furnaces to 
represent all high-volume product classes, including NWG-NC, NWG-C, WG-
NC, NWEF/NWMB, and MH-EF/MB, while teardowns of non-weatherized oil 
units were used for the analysis of the NWO-NC and MH-NWO-NC product 
classes.
b. Cost Estimation Method
    For the October 2023 NOPD, the costs of individual models were 
estimated using the content of the BOMs (i.e., relating to materials, 
fabrication, labor, and all other aspects that make up a production 
facility) to generate MPCs. The resulting MPCs include costs such as 
overhead and depreciation, in addition to materials and labor costs. 
DOE collected information on labor rates, tooling costs, raw material 
prices, and other factors to use as inputs into the cost estimates. For 
purchased parts, DOE estimates the purchase price based on volume-
variable price quotations and detailed discussions with manufacturers 
and component suppliers. Furnace fans are a component of HVAC products 
that include other products not associated with the cost and/or 
efficiency of the furnace fan. Therefore, DOE focused its engineering 
analysis on the components that compose the furnace fan assembly, 
including:
    <bullet> Fan motor and integrated controls (as applicable);
    <bullet> HVAC product control boards;
    <bullet> Impellers;
    <bullet> Single-staging or multi-staging components and controls;
    <bullet> Fan housing, and
    <bullet> Components used to direct or guide airflow.
    For purchased parts, DOE estimated the purchase prices paid to the 
original equipment manufacturers (``OEMs'') of these parts based on 
discussions with manufacturers during confidential interviews. Whenever 
possible, DOE obtained price quotes directly from the component 
suppliers used by furnace fan manufacturers whose products were 
examined in the engineering analysis. DOE determined that the 
components in Table IV.14 are generally purchased from outside 
suppliers.

              Table IV.14--Purchased Furnace Fan Components
------------------------------------------------------------------------
           Assembly              Purchased sub-assemblies or components
------------------------------------------------------------------------
Fan assembly.................  Fan motor.
                               Motor capacitor (when applicable).
                               Impeller.
Controls.....................  Primary control board (``PCB'').
                               Multi-staging components (when
                                applicable).
------------------------------------------------------------------------

    For parts fabricated in-house, the costs of underlying ``raw'' 
materials are determined based on manufacturer interviews, quotes from 
suppliers, and secondary research. Past results are updated 
periodically and/or inflated to present-day prices using indices from 
resources such as MEPS International,\11\ PolymerUpdate,\12\ the U.S. 
Geological Survey (``USGS''),\13\ and the U.S. Bureau of Labor 
Statistics (``BLS'').\14\ The prices of the underlying raw metals 
(e.g., tube, sheet metal) are estimated on the basis of five-year 
averages spanning from 2018 through 2022 to smooth out spikes in 
demand. For non-metal raw material prices (e.g., plastic resins, 
insulation materials), DOE used prices based on current market data, 
rather than a five-year average, because non-metal raw materials 
typically do not experience the same level of price volatility as metal 
raw materials.
---------------------------------------------------------------------------

    \11\ For more information on MEPS International, please visit 
www.mepsinternational.com/gb/en (last accessed March 25, 2024).
    \12\ For more information on PolymerUpdate, please visit 
www.polymerupdate.com (last accessed March 25, 2024).
    \13\ For more information on USGS metal price statistics, please 
visit www.usgs.gov/centers/national-minerals-information-center/commodity-statistics-and-information (last accessed March 25, 2024).
    \14\ For more information on the BLS producer price indices, 
please visit www.bls.gov/ppi/ (last accessed March 25, 2024).
---------------------------------------------------------------------------

    Certain factory parameters--such as fabrication rates, labor rates, 
and wages--also affect the cost of each unit produced. DOE factory 
parameter assumptions were based on internal expertise and manufacturer 
feedback. Table IV.15 lists the factory parameter assumptions used for 
both high-volume and low-volume manufacturers. For the engineering 
analysis, these factory parameters, including production volume, are 
the same at every efficiency level. The production volume used at each 
efficiency level corresponds with the average production volume per 
manufacturer, if 100 percent of all units manufactured were at that 
efficiency level. These assumptions are generalized to represent 
typical production and are not intended to model a specific factory. 
For the NWG-NC, NWG-C, WG-NC, NWEF/NWMB, MH-NWG-NC, MH-NWG-C, and MH-
EF/MB product classes, high production volume parameters were assumed 
due to these classes having generally high production volumes or using 
enough of the same major components as other high production volume 
classes. For NWO-NC and MH-NWO product classes, low production 
parameters were assumed.

                                   Table IV.15--Factory Parameter Assumptions
----------------------------------------------------------------------------------------------------------------
             Parameter                  High-volume furnace fan estimate       Low-volume furnace fan estimate
----------------------------------------------------------------------------------------------------------------
Actual Annual Production Volume      1,500,000............................  5,000.
 (units/year).

[[Page 84006]]

 
Purchased Parts Volume.............  500,000 units/year...................  5,000 units/year.
Workdays Per Year (days)...........  250..................................  250.
Assembly Shifts Per Day (shifts)...  2....................................  1.
Fabrication Shifts Per Day (shifts)  2....................................  2.
Fabrication Labor Wages ($/h)......  16...................................  16.
Assembly Labor Wages ($/h).........  16...................................  16.
Length of Shift (hr)...............  8....................................  8.
Average Equipment Installation Cost  10%..................................  10%.
 (% of purchase price).
Fringe Benefits Ratio..............  50%..................................  50%.
Indirect to Direct Labor Ratio.....  33%..................................  33%.
Average Scrap Recovery Value.......  30%..................................  30%.
Worker Downtime....................  10%..................................  10%.
Building Life (in years)...........  25...................................  25.
Burdened Assembly Labor Wage ($/h).  24...................................  24.
Burdened Fabrication Labor Wage ($/  24...................................  24.
 h).
Supervisor Span (workers/            25...................................  25.
 supervisor).
Supervisor Wage Premium (over        30%..................................  30%.
 fabrication and assembly wage).
----------------------------------------------------------------------------------------------------------------

Constant-Airflow BPM Blower Motor Cost Value
    As discussed in section IV.B.1.a of this document, for the NWG-NC, 
NWG-C, WG-NC, NWEF/NWMB, and MH-WF/MB product classes, the current 
baseline motor technology is a BPM motor, and specifically a CT-BPM 
motor. DOE's research suggests that the predominant BPM indoor blower 
motors sold on the market today are either a constant-torque or a 
constant-airflow design. Both types of motors rely on electronic 
variable-speed motor systems that are typically mounted in an external 
chassis to the back of the motor. CA-BPM motors utilize feedback 
control to adjust torque based on ESP in order to maintain a desired 
airflow. This differentiates them from CT-BPM motors that will maintain 
torque and likely decrease airflow output in environments with high 
ESPs. Additionally, CA-BPM motors use feedback control to vary their 
output to maintain pre-programmed airflows. DOE has found that there 
are no significant differences in measured FER performance between 
furnace fans using CA-BPM and CT-BPM motors; however, CA-BPM motors are 
sometimes chosen for other benefits, such as increased consumer 
comfort. CA-BPM fan motors typically cost more than CT-BPM motors while 
not improving FER. Therefore, as discussed in section IV.B.1.a of this 
document, DOE considered the baseline design to include CT-BPM motors 
for the NWG-NC, NWG-C, WG-NC, NWEF/NWMB, and MH-EF/MB classes. However, 
to better represent costs to consumers, DOE has developed cost values 
for CA-BPMs that are applied in the LCC analysis to a portion of 
furnace fan installations. Table IV.16 shows the cost difference 
between CT-BPM and CA-BPM motors for high-volume and low-volume product 
classes.

         Table IV.16--Incremental Cost Difference for BPM Motors
------------------------------------------------------------------------
                                              Incremental cost increase
               Product class                for CT-BPM to CA-BPM (2022$)
------------------------------------------------------------------------
NWG-C, NWG-NC, WG-NC, NWEF/NWMB, MH-NWG-                          $28.07
 NC, MH-NWG-C, and MH-EF/MB...............
NWO-NC, MH-NWO-NC.........................                         83.67
------------------------------------------------------------------------

Multi-Stage Furnace
    As discussed in section IV.A.2 of this document, DOE has identified 
a number of furnace fans in two-stage and modulating furnaces that are 
rated at the same relative FER as single-stage furnaces. DOE has 
determined that consumers choose to purchase multi-stage products for 
the additional thermal comfort offered by furnaces with multiple stages 
of heating output. During teardowns, DOE examined multi-stage furnace 
designs to analyze the production cost differential for manufacturers 
to switch from single-stage to two-stage or modulating combustion. DOE 
determined a market-share weighted-average marginal cost increase of 
$21.07 for the NWG-C, NWG-NC, WG-NC, NWEF/NWMB, MH-NWG-NC, MH-NWG-C, 
and MH-EF/MB classes to change a furnace from a single-stage to a two-
stage design. DOE determined that oil units with multi-staging were 
rare and, thus, not representative of the market, so DOE did not 
analyze the cost increase of multi-stage burners for the NWO-NC and MH-
NWO-NC product classes. Where applicable, the additional cost to change 
to a two-stage furnace includes the added cost of a two-stage gas 
valve, a two-speed inducer assembly, an additional pressure switch, and 
additional controls and wiring. As with the blower motor costs 
discussed previously, the additional cost of a multi-stage burner is 
accounted for in the LCC analysis based on the market penetration of 
such designs for furnaces.
Scaling to Alternative Input Capacities
    For the October 2023 NOPD, DOE also developed equations to scale 
the MPC results at the representative capacity to the full range of 
input capacities available on the market for each motor type. DOE 
performed regression analyses on the discrete MPCs for each teardown 
and their respective input capacities--which spanned a range of 
capacities and airflows and encompassed a range of motor sizes--to 
generate an equation for each motor technology that reflects the 
relationship between these parameters. These

[[Page 84007]]

parameters were derived separately for high-volume (NWG-C, NWG-NC, MH-
NWG-NC, MH-NWG-C, and WG-NC) and low-volume (NWO-NC and MH-NWO-NC) 
product classes. These equations, which are presented in Table IV.17, 
are used in the LCC analysis (see section IV.E of this document) to 
analyze the impacts on furnace fans over the full range of input 
capacities. To estimate the MPC at a given input, first the appropriate 
adder is calculated using the equation and then the result added to or 
subtracted from (as applicable) the MPC at the representative input 
capacity.

                     Table IV.17--Equations for Scaling MPCs to Additional Input Capacities
----------------------------------------------------------------------------------------------------------------
Input Capacity MPC Scaling Equation: MPC Change = Slope * (Input Capacity (kBtu/h)-Representative Capacity (kBtu/
                                                       h))
-----------------------------------------------------------------------------------------------------------------
                                                                   NWGF-C, NWGF-NC, MH-NWGF-
                                                                     NC, MH-NWGF-C, WGF-NC      NWOF-NC and MH-
                                                                                                    NWOF-NC
----------------------------------------------------------------------------------------------------------------
Motor technology................................................                        Slope              Slope
PSC.............................................................                       0.0650             0.7031
Constant-torque BPM.............................................                       0.1395             0.6272
Constant-airflow BPM............................................                       0.1603             1.0069
----------------------------------------------------------------------------------------------------------------

Backward-Inclined Impellers
    For the max-tech efficiency levels, in the October 2023 NOPD, DOE 
estimated the cost to manufacture a backward-inclined impeller by using 
manufacturer feedback along with photographs and specifications found 
in research reports to determine cost model inputs to estimate the MPCs 
of the backward-inclined impeller. 88 FR 69826, 69847 (Oct. 6, 2023). 
These costs were scaled to different capacities by evaluating the 
impact of the backward-inclined impeller on the overall furnace system, 
depending on the average cabinet width at that capacity. DOE estimated 
the manufacturing cost of implementing a backward-inclined impeller and 
compared it to the average cost of using the forward-inclined impellers 
that are ubiquitous in furnace fans currently on the market to 
determine the incremental increase in MPC associated with implementing 
backward-inclined impellers as compared to forward-inclined impellers. 
The cost increases for backward-inclined impellers at each capacity 
were applied at the max-tech level to estimate the MPCs and are 
outlined in Table IV.18.

          Table IV.18--Backward-Inclined Impeller MPC Increases
------------------------------------------------------------------------
Input capacity (kBtu/h)    High volume (2022$)      Low volume (2022$)
------------------------------------------------------------------------
                  40                    28.60                   34.15
                  60                    34.93                   41.71
                  80                    37.21                   44.43
                 100                    55.18                   65.89
                 120                    59.09                   70.56
------------------------------------------------------------------------

3. Cost-Efficiency Results
    The results of the October 2023 NOPD engineering analysis are the 
MPCs for each furnace fan product class analyzed at each FER efficiency 
level (and associated design option), resulting in a cost-efficiency 
relationship. The cost-efficiency results are shown in tabular form in 
Table IV.19 through Table IV.21 in the form of efficiency versus MPC. 
(Q<INF>Max</INF> is the airflow, in cfm, at the maximum airflow-control 
setting measured using the DOE test procedure.) As described in section 
IV.B.2.b of this document, the MPC presented is not for the entire HVAC 
product, because furnace fans are a component of the HVAC product in 
which they are integrated.
    As discussed in section IV.B.2.b of this document, separate cost 
values were developed for constant-airflow BPM motors and multi-staging 
because these premium design elements could add comfort or provide 
other benefits but were not incorporated as design options into 
efficiency levels for furnace fans used in this analysis.
    DOE used the cost-efficiency curves from the engineering analysis 
as an input to the LCC analysis to determine the added price of the 
more-efficient furnace fan components in HVAC equipment sold to the 
customer (see section IV.E of this document).

  Table IV.19--Cost-Efficiency Results by Product Class--NWG-NC, NWG-C,
                     WGF-NC, NWEF/NWMB, and MH-EF/MB
------------------------------------------------------------------------
                                             Efficiency level
                                 ---------------------------------------
                                               Design option
                                 ---------------------------------------
                                       Baseline              EL 1
                                 ---------------------------------------
                                                          BPM motor +
                                       BPM motor       backward-inclined
                                                           impeller
------------------------------------------------------------------------
MPC.............................  $108.06...........  $136.13.
                                 ---------------------------------------
Product class...................      Maximum allowable FER equation
                                 ---------------------------------------

[[Page 84008]]

 
NWG-NC..........................  0.044 * QMax + 182  0.04 * QMax + 164.
NWG-C...........................  0.044 * QMax + 195  0.04 * QMax + 176.
WG-NC...........................  0.044 * QMax + 199  0.04 * QMax + 179.
NWEF/NWMB.......................  0.044 * QMax + 165  0.04 * QMax + 149.
MH-EF/MB........................  0.044 * QMax + 101  0.04 * QMax + 91.
------------------------------------------------------------------------


                  Table IV.20--Cost-Efficiency Results by Product Class--MH-NWG-NC and MH-NWG-C
----------------------------------------------------------------------------------------------------------------
                                                                    Efficiency level
                                      --------------------------------------------------------------------------
                                                                     Design option
                                      --------------------------------------------------------------------------
                                               Baseline                   EL 1                     EL 2
                                      --------------------------------------------------------------------------
                                                                                          BPM motor + backward-
                                             Improved PSC              BPM motor            inclined impeller
----------------------------------------------------------------------------------------------------------------
MPC..................................  $82.39.................  $108.06................  $136.13.
                                      --------------------------------------------------------------------------
Product class........................                        Maximum allowable FER equation
                                      --------------------------------------------------------------------------
MH-NWG-NC............................  0.071 * QMax + 222.....  0.044 * QMax + 137.....  0.04 * QMax + 123.
MH-NWG-C.............................  0.071 * QMax + 240.....  0.044 * QMax + 148.....  0.04 * QMax + 133.
----------------------------------------------------------------------------------------------------------------


                   Table IV.21--Cost-Efficiency Results by Product Class--NWO-NC and MH-NWO-NC
----------------------------------------------------------------------------------------------------------------
                                                                    Efficiency level
                                      --------------------------------------------------------------------------
                                                                     Design option
                                      --------------------------------------------------------------------------
                                               Baseline                   EL 1                     EL 2
                                      --------------------------------------------------------------------------
                                                                                          BPM motor + backward-
                                             Improved PSC              BPM motor            inclined impeller
----------------------------------------------------------------------------------------------------------------
MPC..................................  $195.61................  $216.95................  $300.62.
                                      --------------------------------------------------------------------------
Product Class........................                        Maximum allowable FER equation
                                      --------------------------------------------------------------------------
NWO-NC...............................  0.071 * QMax + 382.....  0.044 * QMax + 236.....  0.04 * QMax + 212.
MH-NWO-NC............................  0.071 * QMax + 287.....  0.044 * QMax + 176.....  0.04 * QMax + 158.
----------------------------------------------------------------------------------------------------------------

    In commenting on the October 2023 NOPD, Lennox stated that 
equipment costs have increased since the most recent furnace fans 
standards went into effect in 2019. (Lennox, No. 30 at pp. 1-3) The 
commenter argued that consumers are struggling to afford new furnace 
equipment due to inflation and supply-chain issues. Lennox stated that 
this makes increasing furnace fan costs through standards particularly 
ill-advised, and Lennox supported the NOPD's conclusion that amended 
standards are not appropriate. (Id.)
    In response, DOE notes that changes in equipment costs have been 
taken into account in the engineering analysis for this final 
determination. As discussed in section IV.B.2.b of this document, DOE 
gathered price quotations for purchased parts from major suppliers at 
different production volumes during manufacturer interviews that were 
conducted after the standards went into effect in 2019. For parts 
produced in-house, metal raw material prices are estimated on the basis 
of five-year averages, spanning from 2018 through 2022, which includes 
changes since the 2019 standards went into effect. These material costs 
are captured in the cost-efficiency results and, in turn, are reflected 
in the LCC and PBP analyses, which are outlined in section IV.E of this 
document.
    In this final determination DOE maintained the same cost analysis 
as that used for the October 2023 NOPD. As a result, the cost-
efficiency relationships used for this final determination are the same 
as those presented in the October 2023 NOPD.

C. Markups Analysis

    The markups analysis develops appropriate markups (e.g., 
distributor markups, retailer markups, contractor markups) in the 
distribution chain and sales taxes to convert the MSP estimates derived 
in the engineering analysis to consumer prices, which are then used in 
the LCC and PBP analyses. At each step in the distribution channel, 
companies mark up the price of the product to cover business costs and 
profit margin.
    As part of the analysis, DOE identifies key market participants and 
distribution

[[Page 84009]]

channels. As in the October 2023 NOPD, DOE used the same distribution 
channels for furnace fans as it used for furnaces in the recent energy 
conservation standards rulemaking for those products. DOE believes that 
this is an appropriate approach because the vast majority of the 
furnace fans covered in this rulemaking are a component of a furnace. 
DOE has concluded that there is insufficient evidence of a replacement 
market for furnace fans to establish a separate distribution channel on 
that basis.
    DOE developed baseline and incremental markups for each actor in 
the distribution chain. Baseline markups are applied to the price of 
products with baseline efficiency, while incremental markups are 
applied to the difference in price between baseline and higher-
efficiency models (the incremental cost increase). The incremental 
markup is typically less than the baseline markup and is designed to 
maintain similar per-unit operating profit before and after new or 
amended standards.\15\
---------------------------------------------------------------------------

    \15\ Because the projected price of standards-compliant products 
is typically higher than the price of baseline products, using the 
same markup for the incremental cost and the baseline cost would 
result in higher per-unit operating profit. While such an outcome is 
possible, DOE maintains that in markets that are reasonably 
competitive it is unlikely that standards would lead to a 
sustainable increase in profitability in the long run.
---------------------------------------------------------------------------

    To estimate average baseline and incremental markups, DOE relied on 
several sources, including: (1) the HARDI 2013 Profit Report (i.e., for 
wholesalers), and (2) U.S. Census Bureau 2017 Economic Census data on 
the residential and commercial building construction industry (i.e., 
for general contractors, mechanical contractors, and mobile home 
manufacturers). In addition, DOE used the 2005 Air Conditioning 
Contractors of America's (``ACCA's'') financial analysis on the 
heating, ventilation, air-conditioning, and refrigeration contracting 
industry to disaggregate the mechanical contractor markups into 
replacement and new construction markets. DOE also used various sources 
for the derivation of the mobile home dealer markups (see chapter 6 of 
the November 2022 Preliminary Analysis TSD).
    DOE derived State and local taxes from data provided by the Sales 
Tax Clearinghouse.\16\ These data represent weighted averages that 
include county and city rates. DOE applied the State sales taxes to 
match the State-level markups for wholesalers and mechanical and 
general contractors.
---------------------------------------------------------------------------

    \16\ Sales Tax Clearinghouse, Inc., State Sales Tax Rates Along 
With Combined Average City and County Rates (Jan. 4, 2023) 
(Available at: www.thestc.com/STrates.stm) (last accessed June 28, 
2024).
---------------------------------------------------------------------------

    DOE did not receive comments regarding markups in response to the 
October 2023 NOPD. Chapter 6 of the November 2022 Preliminary Analysis 
TSD provides details on DOE's development of markups for consumer 
furnace fans.

D. Energy Use Analysis

    The purpose of the energy use analysis is to determine the annual 
energy consumption of consumer furnace fans at different efficiencies 
in representative U.S. homes and commercial buildings, and to assess 
the energy savings potential of increased consumer furnace fan 
efficiency. The energy use analysis estimates the range of energy use 
of the subject products in the field (i.e., as the products are 
actually used by consumers). The energy use analysis provides the basis 
for other analyses DOE performed, particularly assessments of the 
potential energy savings and the savings in consumer operating costs 
that could result from adoption of amended or new standards.
    For the October 2023 NOPD, DOE primarily used data from the U.S. 
Energy Information Administration's (``EIA's'') 2015 Residential Energy 
Consumption Survey (``RECS 2015'') to establish a reasonable range of 
energy consumption for consumer furnace fans. RECS 2015 is a national 
sample survey of housing units that collects statistical information on 
the consumption of and expenditures for energy in housing units, along 
with data on energy-related characteristics of the housing units and 
occupants. RECS 2015 has a sample size of 5,686 housing units and was 
constructed by EIA to be a national representation of the household 
population in the United States. DOE also considered the use of 
consumer furnace fans in commercial applications, based on 
characteristics from EIA's most recent 2012 Commercial Building Energy 
Consumption Survey (``CBECS 2012'') for a subset of building types that 
use consumer furnace fans covered by a potential standard. DOE utilized 
additional data sources to refine the development of a representative 
population of buildings for each furnace fan product class, as detailed 
in chapter 7 of the November 2022 Preliminary Analysis TSD.
    EIA recently published the microdata for the 2020 edition of 
RECS.\17\ To assess the impact of using RECS 2020, DOE compared the LCC 
consumer sample in the July 2022 Furnace NOPR, which used RECS 2015, to 
the consumer sample used in the December 2023 Furnace Final Rule 
consumer sample, which used RECS 2020. DOE assumed that changes in 
annual energy heating use between the two RECS editions serves as a 
reasonable proxy for the relative change in consumer furnace fans 
energy use. As can be seen by comparing Table 7.4.1 of the TSD for the 
July 2022 Furnace NOPR and Table 7.4.1 of the TSD for the December 2023 
Furnace final rule, the estimated average annual energy consumption by 
region and efficiency level is similar between the two versions of RECS 
for households with furnaces, with RECS 2020 showing slightly lower 
energy consumption. Given the correlation in usage between furnaces and 
furnace fans and given that the estimated furnace energy use declines 
when updating to RECS 2020, updating the consumer sample to RECS 2020 
would not alter the conclusions of this final determination. Therefore, 
DOE continued to use RECS 2015 as the basis for its consumer sample, as 
was done in the October 2023 NOPD.
---------------------------------------------------------------------------

    \17\ Energy Information Administration (EIA), 2020 Residential 
Energy Consumption Survey (RECS) (Available at: www.eia.gov/consumption/residential/data/2020/index.php/) (last accessed June 
11, 2024).
---------------------------------------------------------------------------

    DOE notes that commercial installations of consumer furnace fans 
account for approximately five percent or less of total installations, 
as shown in Table 6.2.1 of the November 2022 Preliminary Analysis TSD. 
Given the relatively small number of installations in the commercial 
sector relative to the residential sector, changes between CBECS 2012 
and 2018 would not significantly impact overall analytical conclusions. 
Therefore, for this final determination, DOE continued to use CBECS 
2012 as the basis of its consumer sample, as was done in October 2023 
NOPD.
    In calculating the energy consumption of furnace fans, DOE adjusted 
the energy use from RECS 2015 and CBECS 2012 to normalize for year-to-
year variation in weather. This was accomplished by adjusting the RECS 
2015 household and CBECS 2012 building energy consumption values based 
on 10-year average heating degree day (``HDD'') and average cooling 
degree day (``CDD'') data for each geographical region. DOE also 
accounted for the change in building shell characteristics by applying 
the building shell efficiency index and projected trend in the HDD and 
CDD in EIA's Annual Energy Outlook 2023 (``AEO 2023'').
    As in the October 2023 NOPD, DOE's analysis takes into account ACCA

[[Page 84010]]

Manuals J, S, and D methods to size every household and building in the 
sample. DOE first uses Manual J to estimate the house or building 
design heating load in order to determine the blower requirements for 
the assigned heating and cooling equipment. DOE's analysis considers 
that typically the furnace fan is sized based on the maximum cooling 
capacity required. The heating and cooling furnace fan speed setting is 
then varied to match the recommended/required airflow performance and 
takes into account differences in the ductwork system curve in the 
field.
    DOE did not receive comments regarding energy use in response to 
the October 2023 NOPD. Chapter 7 of the November 2022 Preliminary 
Analysis TSD provides details on DOE's energy use analysis for consumer 
furnace fans.

E. Life-Cycle Cost and Payback Period Analysis

    DOE conducts LCC and PBP analyses to evaluate the economic impacts 
on individual consumers of potential amended energy conservation 
standards for consumer furnace fans. The effect of new or amended 
energy conservation standards on individual consumers usually involves 
a reduction in operating cost and an increase in purchase cost. DOE 
typically uses the following two metrics to measure consumer impacts:
    [ballot] Life-Cycle Cost (``LCC'') is the total consumer expense of 
operating the product over the lifetime of that product, consisting of 
total installed cost (which includes manufacturer selling price, 
distribution chain markups, sales tax, and installation costs) plus 
operating costs (e.g., expenses for energy use, maintenance, and 
repair). To compute the operating costs, DOE discounts future operating 
costs to the time of purchase and sums them over the lifetime of the 
product.
    [ballot] Payback Period (``PBP'') is the estimated amount of time 
(in years) it takes consumers to recover the increased purchase cost 
(including installation) of a more-efficient product through lower 
operating costs. DOE calculates the PBP by dividing the change in 
purchase cost at higher efficiency levels by the change in annual 
operating cost for the year that amended or new standards are assumed 
to take effect.
    For any given efficiency level, DOE measures the change in LCC 
relative to the LCC in the no-new-standards case, which reflects the 
estimated efficiency distribution of the product in the absence of new 
or amended energy conservation standards. In contrast, the PBP for a 
given efficiency level is measured relative to the baseline product.
    For each considered efficiency level in each product class, DOE 
calculated the LCC and PBP for a nationally representative set of 
housing units and, where appropriate, commercial buildings. As stated 
previously, DOE developed household and commercial building samples 
from RECS 2015 and CBECS 2012, respectively. For each sample household 
or commercial building, DOE determined the energy consumption for the 
consumer furnace fans and the appropriate energy price. By developing a 
representative sample of households and commercial buildings, the 
analysis captured the variability in energy consumption and energy 
prices associated with the use of consumer furnace fans.
    Inputs to the LCC calculation include the installed cost to the 
consumer, operating expenses, the lifetime of the product, and a 
discount rate. Inputs to the calculation of total installed cost 
include the cost of the product--which includes MPCs, manufacturer 
markups, retailer and distributor markups, and sales taxes (where 
applicable)--and installation costs. Inputs to the calculation of 
operating expenses include annual energy consumption, energy prices and 
price projections, repair and maintenance costs, product lifetimes, and 
discount rates. Inputs to the PBP calculation include the installed 
cost to the consumer and first-year operating expenses. DOE created 
distributions of values for installation cost, repair and maintenance, 
product lifetime, discount rates, and sales taxes, with probabilities 
attached to each value, to account for their uncertainty and 
variability.
    The computer model DOE uses to calculate the LCC relies on a Monte 
Carlo simulation to incorporate uncertainty and variability into the 
analysis. The Monte Carlo simulations randomly sample input values from 
the probability distributions and product user samples. For this 
proceeding, the Monte Carlo approach is implemented in Microsoft Excel 
together with the Crystal Ball<SUP>TM</SUP> add-on.\18\ The model 
calculated the LCC for products at each efficiency level for 10,000 
consumers per simulation run. The analytical results include a 
distribution of 10,000 data points showing the range of LCC savings for 
a given efficiency level relative to the no-new-standards case 
efficiency distribution. In performing an iteration of the Monte Carlo 
simulation for a given consumer, product efficiency is chosen based on 
its probability. If the chosen product efficiency is greater than or 
equal to the efficiency of the standard level under consideration, the 
LCC calculation reveals that a consumer is not impacted by the standard 
level. By accounting for consumers who are already projected to 
purchase more-efficient products than the baseline in a given case, DOE 
avoids overstating the potential benefits from increasing product 
efficiency.
---------------------------------------------------------------------------

    \18\ Crystal Ball\TM\ is a commercially-available software tool 
to facilitate the creation of these types of models by generating 
probability distributions and summarizing results within Excel 
(Available at: www.oracle.com/technetwork/middleware/crystalball/overview/index.html) (last accessed June 11, 2024).
---------------------------------------------------------------------------

    DOE calculated the LCC and PBP for consumers of consumer furnace 
fans as if each were to purchase a new product in the expected first 
year of required compliance with new or amended standards. For purposes 
of this final determination, DOE used 2030 as the first year of 
compliance with any amended standards.
    Table IV.22 summarizes the approach and data DOE used to derive 
inputs to the LCC and PBP analysis. The subsections that follow provide 
further discussion. Details of the spreadsheet model, and how all 
inputs to the LCC and PBP analyses are applied, are contained in 
chapter 8 of the November 2022 Preliminary Analysis TSD and its 
appendices.

                    Table IV.22--Summary of Inputs and Methods for the LCC and PBP Analyses *
----------------------------------------------------------------------------------------------------------------
                           Inputs                                                Source/method
----------------------------------------------------------------------------------------------------------------
Product Cost................................................  Derived from the manufacturer production cost
                                                               (``MPC'') for furnace fans at different heating
                                                               input capacities for each efficiency level (from
                                                               the engineering analysis). The MPCs are then
                                                               multiplied by the various market participant
                                                               markups (e.g., manufacturer, wholesaler, and
                                                               plumbing contractor) for each distribution
                                                               channel and sales taxes derived for each State
                                                               and the District of Columbia.

[[Page 84011]]

 
Installation Costs..........................................  Varies by efficiency level and individual house/
                                                               building characteristic. Material and labor costs
                                                               are derived for each State and the District of
                                                               Columbia mainly using RSMeans Residential Cost
                                                               Data 2023. Overhead and profits are included in
                                                               the RSMeans data. Probability distributions are
                                                               derived for various installation cost input
                                                               parameters.
Annual Energy Use...........................................  Derived mainly by using the heating energy use
                                                               data for each housing unit and building from the
                                                               Energy Information Administration's (``EIA's'')
                                                               2015 Residential Energy Consumption Survey
                                                               (``RECS 2015'') and EIA's 2012 Commercial
                                                               Buildings Energy Consumption Survey (``CBECS
                                                               2012''), together with consumer furnace fans test
                                                               procedure calculation methodologies used to
                                                               determine the annual energy consumption
                                                               associated with the considered standard levels.
                                                               Probability distributions are derived for various
                                                               input parameters.
Energy Prices...............................................  Calculated monthly marginal average electricity,
                                                               natural gas or liquefied petroleum gas (``LPG''),
                                                               and fuel oil prices in each of the 50 U.S. States
                                                               and District of Columbia, using EIA historical
                                                               data and billing data for each RECS 2015 housing
                                                               unit and CBECS 2012 building.
Energy Price Trends.........................................  Residential and commercial prices were escalated
                                                               by using EIA's Annual Energy Outlook 2023 (AEO
                                                               2023) forecasts to estimate future energy prices.
                                                               Escalation was performed at the Census Division
                                                               level.
Repair and Maintenance Costs................................  Estimated the costs associated with preventive
                                                               maintenance (e.g., checking furnace fan) and
                                                               repair (e.g., replacing motor) based on data from
                                                               a variety of published sources, including RSMeans
                                                               2023 Facilities Maintenance and Repair Data. It
                                                               is assumed that maintenance and repair costs vary
                                                               by efficiency level, and probability
                                                               distributions are derived for various input
                                                               parameters.
Product Lifetime............................................  Used Weibull probability distribution of lifetimes
                                                               developed for consumer furnace fans based on
                                                               various survey and shipments data.
Discount Rates..............................................  Probability distributions by income bins are
                                                               derived for residential discount rates based on
                                                               the Federal Reserve Board's Survey of Consumer
                                                               Finances from 1995 to 2019 and various interest
                                                               rate sources. Probability distributions for
                                                               commercial discount rates for various building
                                                               activities (e.g., office) are derived using
                                                               multiple interest rate sources. See section
                                                               IV.E.7 of this document.
Compliance Date.............................................  2030 (five years after expected publication of the
                                                               final rule).
----------------------------------------------------------------------------------------------------------------
* References for the data sources mentioned in this table are provided in the sections following the table or in
  chapter 8 of the November 2022 Preliminary Analysis TSD. Energy price trends, product lifetimes, and discount
  rates are not used for the PBP calculation.

1. Product Cost
    To calculate consumer product costs, DOE multiplied the MPCs 
developed in the engineering analysis by the markups described 
previously (along with sales taxes). DOE used different markups for 
baseline products and higher-efficiency products, because DOE applies 
an incremental markup to the increase in MSP associated with higher-
efficiency products.
    For the October 2023 NOPD, DOE assumed no price trend for consumer 
furnace fans due to uncertainty in future commodity prices. DOE did not 
receive comment on this assumption and maintains the same approach for 
this final determination.
    See chapter 8 of the November 2022 Preliminary Analysis TSD for 
details.
2. Installation Cost
    Installation cost includes labor, overhead, and any miscellaneous 
materials and parts needed to install the product. Because consumer 
furnace fans are installed in furnaces in the factory, there is 
generally no additional installation cost in the home. However, 
consumer furnace fans that employ a constant-airflow BPM design may 
require additional installation costs. DOE assumed that all constant-
airflow BPM furnace fan installations will require extra labor at 
startup to check and adjust airflow.
    As in the October 2023 NOPD, DOE estimated the installation costs 
at each considered efficiency level using a variety of sources, 
including RSMeans data, manufacturer literature, and information from 
an expert consultant report. DOE's analysis of installation costs 
accounted for regional differences in labor costs. For a detailed 
discussion of the development of installation costs, see appendix 8C of 
the November 2022 Preliminary Analysis TSD.
3. Annual Energy Consumption
    For each sampled household or commercial building, DOE determined 
the energy consumption for a consumer furnace fan at different 
efficiency levels using the approach described previously in section 
IV.D of this document.
4. Energy Prices
    Energy bills to consumers typically include fixed costs (i.e., 
costs that do not depend on consumption) and costs that depend on the 
level of consumption. To estimate the impact of standards on consumer 
operating costs, DOE calculated average energy prices, which represent 
the typical cost for a consumer to use energy, including fixed costs, 
and marginal energy prices, which represent the energy price consumers 
would pay for reduced consumption. In other words, a marginal energy 
price reflects the cost or benefit of adding or subtracting one 
additional unit of energy consumption. Because marginal price more 
accurately captures the incremental savings associated with a change in 
energy use from higher efficiency, it provides a better representation 
of incremental change in consumer costs than average electricity 
prices. DOE applied average natural gas and electricity prices for the 
energy use of the product purchased in the no-new-standards case, and 
marginal prices for the incremental change in energy use associated 
with the other efficiency levels considered.
    For the October 2023 NOPD, DOE derived average monthly marginal 
residential and commercial electricity, natural gas, LPG, and fuel oil 
prices for each State using data from EIA.<SUP>19 20 21</SUP> DOE 
calculated marginal monthly regional energy prices by: (1) first 
estimating an average annual price for each region; (2) multiplying by 
monthly energy price factors; and (3) multiplying by seasonal marginal 
price factors for electricity, natural gas, and LPG. The

[[Page 84012]]

analysis used 2022 data for residential and commercial natural gas and 
electricity prices and 2021 data for LPG and fuel oil prices. Further 
details may be found in chapter 8 of the Preliminary Analysis TSD.
---------------------------------------------------------------------------

    \19\ EIA, Form EIA-861M (formerly EIA-826) detailed data (2022) 
(Available at: www.eia.gov/electricity/data/eia861m/) (last accessed 
June 28, 2024).
    \20\ EIA, Natural Gas Navigator (2022) (Available at: 
www.eia.gov/naturalgas/data.php) (last accessed June 11, 2024).
    \21\ EIA, 2021 State Energy Data System (SEDS) (2021) (Available 
at: www.eia.gov/state/seds/) (last accessed June 11, 2024).
---------------------------------------------------------------------------

    For the October 2023 NOPD, DOE compared marginal price factors 
developed by DOE from the EIA data to develop seasonal marginal price 
factors for 23 gas tariffs provided by the Gas Technology Institute for 
the 2016 residential boilers energy conservation standards 
rulemaking.\22\ DOE found that the winter price factors used by DOE are 
generally comparable to those computed from the tariff data, indicating 
that DOE's marginal price estimates are reasonable at average usage 
levels. The summer price factors are also generally comparable. Of the 
23 tariffs analyzed, eight have multiple tiers, and of these eight, six 
have ascending rates and two have descending rates. The tariff-based 
marginal factors use an average of the two tiers as the commodity 
price. A full tariff-based analysis would require information about the 
household's total baseline gas usage (to establish which tier the 
consumer is in), and a weight factor for each tariff that determines 
how many customers are served by that utility on that tariff. These 
data are generally not available in the public domain. DOE's use of EIA 
State-level data effectively averages overall consumer sales in each 
State, and so incorporates information from all utilities. DOE's 
approach is, therefore, more representative of a large group of 
consumers with diverse baseline gas usage levels than an approach that 
uses only tariffs.
---------------------------------------------------------------------------

    \22\ The Gas Technology Institute provided a reference located 
in the docket of DOE's 2016 rulemaking to develop energy 
conservation standards for residential boilers. (Docket No. EERE-
2012-BT-STD-0047-0068) (Available at: www.regulations.gov/document/EERE-2012-BT-STD-0047-0068) (last accessed June 28, 2024).
---------------------------------------------------------------------------

    DOE notes that within a State, there could be significant variation 
in the marginal price factors, including differences between rural and 
urban rates. To take this into account, DOE developed marginal price 
factors for each individual household using RECS 2015 billing data. 
These data are then normalized to match the average State marginal 
price factors, which are equivalent to a consumption-weighted average 
marginal price across all households in the State. For more details on 
the comparative analysis and updated marginal price analysis, see 
appendix 8D of the November 2022 Preliminary Analysis TSD.
    To estimate energy prices in future years, DOE multiplied the 2022 
energy prices by the projection of annual average price changes for 
each of the nine Census Divisions from the Reference case in AEO 2023, 
which has an end year of 2050.\23\ To estimate price trends after 2050, 
DOE used the average annual rate of change in prices from 2046 through 
2050.
---------------------------------------------------------------------------

    \23\ EIA, Annual Energy Outlook 2023 with Projections to 2050, 
Washington, DC (Available at: www.eia.gov/forecasts/aeo/) (last 
accessed June 11, 2024).
---------------------------------------------------------------------------

    To assess the impact of updated energy price estimates, DOE 
compared the energy price estimates in 2030 from the October 2023 NOPD 
to the projected estimates using updated EIA energy price data from 
2023. The results of this comparison are presented in Table IV.23.

    Table IV.23--Summary of Energy Price Comparison of 2023 EIA Data
                     Relative to November 2023 NOPD
------------------------------------------------------------------------
                                                           Percentage
                      Energy type                        change in 2030
                                                          energy price
------------------------------------------------------------------------
Electricity...........................................               -20
Natural Gas...........................................                 1
LPG...................................................                 1
Fuel Oil..............................................               -16
------------------------------------------------------------------------

    Based upon this review, DOE has determined that energy prices have 
either not changed significantly, as in the case of natural gas and 
LPG, or have decreased, as in the case of electricity and fuel oil, 
relative to the energy prices used in the October 2023 NOPD. 
Consequently, updating energy prices would either have no impact on 
analytical results or decrease operating cost savings, thereby further 
justifying DOE's decision to not amend the existing energy conservation 
standards for consumer furnace fans. DOE did not receive comments 
regarding energy prices in response to the October 2023 NOPD. As a 
result, DOE has continued to use the energy prices from the October 
2023 NOPD in this determination.
5. Maintenance and Repair Costs
    The maintenance cost is the routine cost to the consumer of 
maintaining product operation. The regular furnace maintenance 
generally includes checking the furnace fan. As in the October 2023 
NOPD, DOE assumes for this analysis that this maintenance cost is the 
same at all efficiency levels.
    The repair cost is the cost to the consumer for replacing or 
repairing components in the consumer furnace fan that have failed. For 
the October 2023 NOPR, DOE included motor replacement as a repair cost 
for a fraction of furnace fans. To estimate rates of motor failure, DOE 
developed a distribution of fan motor lifetime (expressed in operating 
hours) by motor size using data from DOE's analysis for the March 9, 
2010 Small Electric Motors Final Rule and manufacturer literature. (75 
FR 10874) DOE then paired these data with the calculated number of 
annual operating hours for each sample furnace fan. Motor costs were 
based on costs developed in the engineering analysis and the 
replacement markups developed in the markup analysis. DOE assumed that 
the motor cost does not apply if motor failure occurs during the 
furnace warranty period (assumed to be at least one year, and five or 
more years for a fraction of installations).
    For the October 2023 NOPD, the repair costs (including labor hours, 
component costs, and frequency) at each considered efficiency level 
were derived based on RSMeans data,\24\ manufacturer literature, and a 
report from the Gas Research Institute.\25\ DOE accounted for regional 
differences in labor costs. DOE did not receive comments related to its 
repair cost assumptions, and accordingly, the Department has maintained 
the same costs as used in the October 2023 NOPD for this final 
determination.
---------------------------------------------------------------------------

    \24\ RSMeans Company Inc., RS Means Facilities Maintenance & 
Repair Cost Data (2021) (Available at: www.rsmeans.com/) (last 
accessed June 1, 2024).
    \25\ Jakob, F.E., et al., Assessment of Technology for Improving 
the Efficiency of Residential Gas Furnaces and Boilers, Volume I and 
II--Appendices (September 1994), Gas Research Institute, Report No. 
GRI-94/0175 (Available at: www.gti.energy/software-and-reports/) 
(last accessed Feb. 15, 2022).
---------------------------------------------------------------------------

    For a detailed discussion of the development of maintenance and 
repair costs, see appendix 8E of the November 2022 Preliminary Analysis 
TSD.
6. Product Lifetime
    Product lifetime is the age at which an appliance is retired from 
service. Furnace fan lifetimes are considered equivalent to furnace 
lifetimes, so DOE modeled furnace fan lifetime based on estimated 
furnace lifetimes. Because product lifetime varies, DOE uses a lifetime 
distribution to characterize the probability that a product will be 
retired from service at a given age. DOE conducted an extensive 
literature review and took into account published studies. Because the 
basis for the estimates in the literature was uncertain, DOE developed 
a method using national survey data, along with shipment data, to 
estimate the distribution of consumer furnace lifetimes in the field.

[[Page 84013]]

    DOE assumed that the probability function for the annual survival 
of consumer furnaces would take the form of a Weibull distribution. For 
the October 2023 NOPD, DOE derived the Weibull distribution parameters 
by using stock and age data on consumer furnaces from the U.S. Census's 
biennial American Housing Survey (``AHS'') from 1974-2019 \26\ and 
EIA's RECS 1990, 1993, 2001, 2005, 2009, and 2015.\27\ DOE used the 
results from the 2022 American Home Comfort Survey (``AHCS'') to 
estimate the national average lifetime of 21.4 years.\28\ DOE also 
determined the average lifetime for different regions: 22.5 years for 
the North region and 20.2 years for rest of the country. These results 
were used to scale the average lifetime for these regions.
---------------------------------------------------------------------------

    \26\ U.S. Census Bureau: Housing and Household Economic 
Statistics Division, American Housing Survey, Multiple Years (1974, 
1975, 1976, 1977, 1978, 1979, 1980, 1981, 1983, 1985, 1987, 1989, 
1991, 1993, 1995, 1997, 1999, 2001, 2003, 2005, 2007, 2009, 2011, 
2013, 2015, 2017, 2019, and 2021) (Available at: www.census.gov/programs-surveys/ahs.html) (last accessed June 28, 2024).
    \27\ U.S. Department of Energy: Energy Information 
Administration, Residential Energy Consumption Survey (``RECS''), 
Multiple Years (1990, 1993, 1997, 2001, 2005, 2009, and 2015) 
(Available at: www.eia.gov/consumption/residential/) (last accessed 
June 28, 2024).
    \28\ Decision Analysts, 2022 American Home Comfort Study (2022) 
Arlington, Texas (Available at: www.decisionanalyst.com/syndicated/homecomfort/) (last accessed August 26, 2024).
---------------------------------------------------------------------------

    DOE did not receive any comments on the lifetime distributions used 
in the October 2023 NOPD. As consumer furnace fans, and the furnaces in 
which they reside, have not changed significantly since the October 
2023 NOPD, DOE has maintained the same lifetime distribution in this 
final determination.
7. Discount Rates
    In the calculation of LCC, DOE applies discount rates appropriate 
to estimate the present value of future expenditures and savings. DOE 
estimated a distribution of discount rates for consumer furnace fans 
based on the opportunity cost of funds. DOE estimates discount rates 
separately for residential and commercial end users.
    For residential end users, DOE applies weighted-average discount 
rates calculated from consumer debt and asset data, rather than 
marginal or implicit discount rates.\29\ The LCC analysis estimates net 
present value over the lifetime of the product, so the appropriate 
discount rate will reflect the general opportunity cost of household 
funds, taking this time scale into account. Given the long time horizon 
modeled in the LCC analysis, the application of a marginal interest 
rate associated with an initial source of funds is inaccurate. 
Regardless of the method of purchase, consumers are expected to 
continue to rebalance their debt and asset holdings over the LCC 
analysis period, based on the restrictions consumers face in their debt 
payment requirements and the relative size of the interest rates 
available on debts and assets.
---------------------------------------------------------------------------

    \29\ The implicit discount rate is inferred from a consumer 
purchase decision between two otherwise identical goods with 
different first cost and operating cost. It is the interest rate 
that equates the increment of first cost to the difference in net 
present value of lifetime operating cost, incorporating the 
influence of several factors: transaction costs, risk premiums and 
response to uncertainty, time preferences, and interest rates at 
which a consumer is able to borrow or lend. The implicit discount 
rate is not appropriate for the LCC analysis because it reflects a 
range of factors that influence consumer purchase decisions, rather 
than the opportunity cost of the funds that are used in purchases.
---------------------------------------------------------------------------

    To establish residential discount rates for the LCC analysis, DOE 
identified all relevant household debt or asset classes in order to 
approximate a consumer's opportunity cost of funds related to appliance 
energy cost savings. It estimated the average percentage shares of the 
various types of debt and equity by household income group using data 
from the Federal Reserve Board's triennial Survey of Consumer Finances 
\30\ (``SCF''). Using the SCF and other sources, DOE developed a 
distribution of rates for each type of debt and asset by income group 
to represent the rates that may apply in the year in which amended 
standards would take effect. DOE assigned each sample household a 
specific discount rate drawn from one of the distributions. The average 
rate across all types of household debt and equity and income groups, 
weighted by the shares of each type, is 4.1 percent.
---------------------------------------------------------------------------

    \30\ U.S. Board of Governors of the Federal Reserve System, 
Survey of Consumer Finances, 1995, 1998, 2001, 2004, 2007, 2010, 
2013, 2016, and 2019 (Available at: www.federalreserve.gov/econresdata/scf/scfindex.htm) (last accessed April 26, 2024).
---------------------------------------------------------------------------

    To establish commercial discount rates for commercial end users in 
the small fraction of consumer furnace fans in commercial buildings, 
DOE estimated the weighted-average cost of capital using data from 
Damodaran Online.\31\ The weighted-average cost of capital is commonly 
used to estimate the present value of cash flows to be derived from a 
typical company project or investment. Most companies use both debt and 
equity capital to fund investments, so their cost of capital is the 
weighted average of the cost to the firm of equity and debt financing. 
DOE estimated the cost of equity using the capital asset pricing model, 
which assumes that the cost of equity for a particular company is 
proportional to the systematic risk faced by that company. The average 
rate for consumer furnace fans used in commercial applications in this 
analysis, across all business activity, is 7.2 percent. DOE did not 
receive comments regarding discount rates in response to the October 
2023 NOPD.
---------------------------------------------------------------------------

    \31\ Damodaran, A. Data Page: Historical Returns on Stocks, 
Bonds and Bills-United States (2023) (Available at: 
pages.stern.nyu.edu/~adamodar/) (Last accessed June 1, 2024).
---------------------------------------------------------------------------

    See chapter 8 of the November 2022 Preliminary Analysis TSD for 
further details on the development of consumer and commercial discount 
rates.
8. Energy-Efficiency Distribution in the No-New-Standards Case
    To accurately estimate the share of consumers that would be 
affected by a potential energy conservation standard at a particular 
efficiency level, DOE's LCC analysis considered the projected 
distribution (i.e., market shares) of product efficiencies under the 
no-new-standards case (i.e., the case without amended or new energy 
conservation standards) in the compliance year (2030). This approach 
reflects the fact that some consumers may purchase products with 
efficiencies greater than the baseline levels, even in the absence of 
new or amended standards.
    For consumer furnace fans, DOE does not have any shipments data by 
efficiency after the 2019 furnace fan standards became effective. Due 
to the lack of available shipments data, DOE used DOE's CCD for furnace 
fans and furnaces as a proxy to develop an efficiency distribution 
based on available models.
    DOE did not receive additional data or comments on estimated market 
shares in the no-new-standard case in response to the October 2023 
NOPD. Accordingly, DOE continued to use estimates from the October 2023 
NOPD for this final determination.
    Table IV.24 shows the resulting market shares by efficiency level. 
For a detailed discussion of the development of no-new-standards case 
distributions based on models, see appendix 7F of the November 2022 
Preliminary Analysis TSD.

[[Page 84014]]



      Table IV.24--No-New-Standards Case Energy Efficiency Distributions in 2030 for Consumer Furnace Fans
----------------------------------------------------------------------------------------------------------------
                                                                                  No-new-   Efficiency level (%)
                           Product class                                 EL      standards ---------------------
                                                                                 case (%)       1          2
----------------------------------------------------------------------------------------------------------------
Non-Weatherized, Non-Condensing Gas Furnace Fan....................          0         100  .........  .........
                                                                             1  ..........        100  .........
NonWeatherized, Condensing Gas Furnace Fan.........................          0         100  .........  .........
                                                                             1  ..........        100  .........
Weatherized NonCondensing Gas Furnace Fan..........................          0         100  .........  .........
                                                                             1  ..........        100  .........
NonWeatherized, NonCondensing Oil Furnace Fan......................          0          46  .........  .........
                                                                             1          54        100  .........
                                                                             2  ..........  .........        100
NonWeatherized Electric Furnace/Modular Blower Fan.................          0         100  .........  .........
                                                                             1  ..........        100  .........
Mobile Home NonWeatherized, NonCondensing Gas Furnace Fan..........          0          11  .........  .........
                                                                             1          89        100  .........
                                                                             2  ..........  .........        100
Mobile Home NonWeatherized, Condensing Gas Furnace Fan.............          0           8  .........  .........
                                                                             1          92        100  .........
                                                                             2  ..........  .........        100
Mobile Home NonWeatherized Oil Furnace Fan.........................          0          90  .........  .........
                                                                             1          10        100  .........
                                                                             2  ..........  .........        100
Mobile Home Electric Furnace/Modular Blower Fan....................          0         100  .........  .........
                                                                             1  ..........        100  .........
----------------------------------------------------------------------------------------------------------------

    The LCC Monte Carlo simulations draw from the efficiency 
distributions and assign an efficiency to the consumer furnace fans 
purchased by each sample household or commercial business in the no-
new-standards case. The resulting percentage shares within the sample 
match the market shares in the efficiency distributions.
9. Payback Period Analysis
    The payback period is the amount of time (expressed in years) it 
takes the consumer to recover the additional installed cost of more-
efficient products, compared to baseline products, through energy cost 
savings. Payback periods that exceed the life of the product mean that 
the increased total installed cost is not recovered in reduced 
operating expenses.
    The inputs to the PBP calculation for each efficiency level are the 
change in total installed cost of the product and the change in the 
first-year annual operating expenditures relative to the baseline. DOE 
refers to this as a ``simple PBP'' because it does not consider changes 
over time in operating cost savings. The PBP calculation uses the same 
inputs as the LCC analysis when deriving first-year operating costs, 
except that discount rates are not needed. DOE did not receive comments 
regarding the payback period methodology in response to the October 
2023 NOPD.

F. Shipments Analysis

    DOE uses projections of annual product shipments to calculate the 
national impacts of potential amended or new energy conservation 
standards on energy use, NPV, and future manufacturer cash flows.\32\ 
The shipments model takes an accounting approach, tracking market 
shares of each product class and the vintage of units in the stock. 
Stock accounting uses product shipments as inputs to estimate the age 
distribution of in-service product stocks for all years. The age 
distribution of in-service product stocks is a key input to 
calculations of both the NES and NPV, because operating costs for any 
year depend on the age distribution of the stock.
---------------------------------------------------------------------------

    \32\ DOE uses data on manufacturer shipments as a proxy for 
national sales, as aggregate data on sales are lacking. In general, 
one would expect a close correspondence between shipments and sales.
---------------------------------------------------------------------------

    DOE developed shipment projections based on historical data and an 
analysis of key market drivers for each product. The vast majority of 
furnace fans are shipped installed in furnaces, so DOE estimated 
furnace fan shipments by projecting furnace shipments in three market 
segments: (1) replacements, (2) new housing, and (3) new owners in 
buildings that did not previously have a central furnace.
    To project furnace replacement shipments, DOE developed retirement 
functions for furnaces from the lifetime estimates and applied them to 
the existing products in the housing stock. The existing stock of 
products is tracked by vintage and developed from historical shipments 
data. The shipments analysis uses a distribution of furnace lifetimes 
to estimate furnace replacement shipments. In addition, DOE adjusted 
replacement shipments by taking into account demolitions, using the 
estimated changes to the housing stock from AEO 2023.
    DOE assembled historical shipments data for consumer furnaces from 
Appliance Magazine from 1954-2012,\33\ AHRI from 1996-2022,\34\ HARDI 
from 2013-2022,\35\ and BRG from 2007-2022.\36\ DOE also used the 1992 
and 1994-2003 shipments data by State provided by AHRI \37\ and 2004-
2009 and 2010-2015 shipments data by the North region and the rest of 
country

[[Page 84015]]

provided by AHRI,\38\ as well as HARDI shipments data that is 
disaggregated by region and most States to disaggregate shipments by 
region. DOE also used CBECS 2012 data and BRG shipments data to 
estimate the commercial fraction of shipments. Disaggregated shipments 
for mobile home gas furnaces (``MHGFs'') are not available, so DOE 
disaggregated MHGF shipments from the total by using a combination of 
data from the U.S. Census,<SUP>39 40</SUP> AHS,\41\ RECS,\42\ and a 
2014 MHGF shipments estimate by Mortex.\43\
---------------------------------------------------------------------------

    \33\ Appliance Magazine, Appliance Historical Statistical 
Review: 1954-2012 (2014).
    \34\ Air-Conditioning, Heating, & Refrigeration Institute 
(``AHRI''), Furnace Historical Shipments Data (1996-2022) (Available 
at: www.ahrinet.org/analytics/statistics/historical-data/furnaces-historical-data) (last accessed June 28, 2024).
    \35\ Heating, Air-conditioning and Refrigeration Distributors 
International (``HARDI''), Gas Furnace Shipments Data from 2013-2022 
(Provided to Lawrence Berkeley National Laboratory).
    \36\ BRG Building Solutions, The North American Heating & 
Cooling Product Markets (Available at: www.brgbuildingsolutions.com/solutions/market-reports/) (last accessed June 28, 2024).
    \37\ AHRI (formerly Gas Appliance Manufacturers Association 
(``GAMA'')), Updated Shipments Data for Residential Furnaces and 
Boilers (April 25, 2005) (Available at: www.regulations.gov/document/EERE-2006-STD-0102-0138) (last accessed June 28, 2024).
    \38\ AHRI, Non-Condensing and Condensing Regional Gas Furnace 
Shipments for 2004-2009 and 2010-2015 Data Provided to DOE 
contractors (July 20, 2010 and November 26, 2016).
    \39\ U.S. Census Bureau, Manufactured Homes Survey: Annual 
Shipments to States from 1994-2022 (Available at: www.census.gov/data/tables/time-series/econ/mhs/latest-data.html) (last accessed 
June 28, 2024).
    \40\ U.S. Census Bureau, Manufactured Homes Survey: Historical 
Annual Placements by State from 1980-2013 (Available at: 
www.census.gov/data/tables/time-series/econ/mhs/historical-annual-placements.html) (last accessed June 28, 2024).
    \41\ U.S. Census Bureau--Housing and Household Economic 
Statistics Division, American Housing Survey, multiple years from 
1973-2021 (Available at: www.census.gov/programs-surveys/ahs/data.html) (last accessed June 28, 2024).
    \42\ EIA, Residential Energy Consumption Survey (RECS), multiple 
years from 1979-2015 (Available at: www.eia.gov/consumption/residential/) (last accessed June 28, 2024).
    \43\ Mortex estimated that the total number of MHGFs 
manufactured in 2014 was about 54,000, and about two-thirds were 
sold to the replacement market. Mortex also stated that MHGF sales 
have not been growing. (Mortex, No. 157 at p. 3) (Available at: 
www.regulations.gov/document/EERE-2014-BT-STD-0031-0157) (last 
accessed June 28, 2024).
---------------------------------------------------------------------------

    To project shipments to the new housing market, DOE utilized a 
projection of new housing construction and historic saturation rates of 
various furnaces in new housing. DOE used the AEO 2023 housing starts 
and commercial building floor space projections and data from the U.S. 
Census Bureau's Characteristics of New Housing,<SUP>44 45</SUP> Home 
Innovation Research Labs Annual Builder Practices Survey,\46\ RECS 
2015, AHS 2021, and CBECS 2012 to estimate new construction 
saturations. DOE also estimated future furnace saturation rates in new 
single-family housing based on a weighted average of values from the 
U.S. Census Bureau's Characteristics of New Housing from 1999 through 
2022, and for multi-family buildings using data from the Census 
Bureau's Characteristics of New Housing (Multi-Family Units) from 1973 
through 2022.\47\
---------------------------------------------------------------------------

    \44\ U.S. Census, Characteristics of New Housing from 1999-2022 
(Available at: www.census.gov/construction/chars/) (last accessed 
June 1, 2023).
    \45\ U.S. Census, Characteristics of New Housing (Multi-Family 
Units) from 1973-2022 (Available at: www.census.gov/construction/chars/mfu.html) (last accessed June 1, 2023).
    \46\ Home Innovation Research Labs (independent subsidiary of 
the National Association of Home Builders (NAHB), Annual Builder 
Practices Survey (2015-2019) (Available at: www.homeinnovation.com/trends_and_reports/data/new_construction) (last accessed June 28, 
2024).
    \47\ U.S. Census Bureau, Characteristics of New Housing 
(Available at: www.census.gov/construction/chars/) (last accessed 
June 28, 2024).
---------------------------------------------------------------------------

    To project shipments to the new-owner market, DOE estimated the new 
owners based on the residual shipments from the calculated replacement 
and new construction shipments compared to historical shipments over 
five years (2018-2022). DOE compared this with data from Decision 
Analyst's 2002 to 2022 AHCS,\48\ 2023 BRG data,\49\ and AHRI's 
estimated shipments in 2000,\50\ which showed similar historical 
fractions of new owners. DOE assumed that the new-owner fraction would 
be the 10-year average (2013-2022) in 2030 and then decrease to zero by 
the end of the analysis period (2059).
---------------------------------------------------------------------------

    \48\ Decision Analyst, 2002, 2004, 2006, 2008, 2010, 2013, 2016, 
2019, and 2022 American Home Comfort Study (Available at: 
www.decisionanalyst.com/syndicated/homecomfort/) (last accessed June 
28, 2024).
    \49\ BRG data (Available at: www.brgbuildingsolutions.com/) 
(last accessed June 28, 2024).
    \50\ AHRI (formerly GAMA), Furnace and Boiler Shipments data 
provided to DOE for Furnace and Boiler ANOPR (Jan. 23, 2002).
---------------------------------------------------------------------------

    DOE did not receive comments on the shipments methodology in 
response to the October 2023 NOPD. DOE notes that although there may be 
additional historical data available for 2023, including an additional 
year of historical data would have a minimal impact to projected 
shipments over the shipments analysis period (2030-2059). Additionally, 
the October 2023 NOPD relied on AEO 2023, which remains the most recent 
available edition for AEO for many key inputs for future product 
demand. For these reasons, DOE continued to use shipments from the 
October 2023 NOPD for this final determination.

G. National Impact Analysis

    The NIA assesses the NES and the NPV from a national perspective of 
total consumer costs and savings that would be expected to result from 
new or amended energy conservation standards at specific efficiency 
levels.\51\ (``Consumer'' in this context refers to consumers of the 
product being regulated.) DOE calculates the NES and NPV for the 
potential standard levels considered based on projections of annual 
product shipments, along with the annual energy consumption and total 
installed cost data from the energy use and LCC analyses.\52\ For the 
present analysis, DOE projected the energy savings, operating cost 
savings, product costs, and NPV of consumer benefits over the lifetime 
of consumer furnace fans sold from 2030 through 2059.
---------------------------------------------------------------------------

    \51\ The NIA accounts for impacts in the United States and U.S. 
territories.
    \52\ For the NIA, DOE adjusts the installed cost data from the 
LCC analysis to exclude sales tax, which is a transfer.
---------------------------------------------------------------------------

    DOE evaluates the impacts of new or amended standards by comparing 
a case without such standards with standards-case projections. The no-
new-standards case characterizes energy use and consumer costs for each 
product class in the absence of new or amended energy conservation 
standards. For this projection, DOE considers historical trends in 
efficiency and various forces that are likely to affect the mix of 
efficiencies over time. DOE compares the no-new-standards case with 
projections characterizing the market for each product class if DOE 
adopted new or amended standards at specific energy efficiency levels 
(i.e., the candidate standards levels (``CSLs'') or standards cases) 
for that class. For the standards cases, DOE considers how a given 
standard would likely affect the market shares of products with 
efficiencies greater than the standard.
    DOE uses a spreadsheet model to calculate the energy savings and 
the national consumer costs and savings from each CSL. Interested 
parties can review DOE's analyses by changing various input quantities 
within the spreadsheet. The NIA spreadsheet model uses typical values 
(as opposed to probability distributions) as inputs.
    Table IV.25 summarizes the inputs and methods DOE used for the NIA 
for the final determination. Discussion of these inputs and methods 
follows the table. See chapter 10 of the November 2022 Preliminary 
Analysis TSD for details.

   Table IV.25--Summary of Inputs and Methods for the National Impact
                                Analysis
------------------------------------------------------------------------
            Input                                Method
------------------------------------------------------------------------
Shipments....................  Annual shipments from shipments model.

[[Page 84016]]

 
Compliance Date of Standard..  2030.
Efficiency Trends............  No-new-standards case based on historical
                                shipment data and on current consumer
                                furnace fans model availability by
                                efficiency level (see chapter 8 of the
                                November 2022 Preliminary Analysis TSD).
                               Roll-up in the compliance year for
                                standards cases.
Annual Energy Consumption per  Annual weighted-average values are a
 Unit.                          function of shipments-weighted unit
                                energy use consumption.
Total Installed Cost per Unit  Annual weighted-average values as a
                                function of the efficiency distribution
                                (see chapter 8 of the November 2022
                                Preliminary Analysis TSD).
Annual Energy Cost per Unit..  Annual weighted-average values as a
                                function of the annual energy
                                consumption per unit and energy prices.
Repair and Maintenance Cost    Annual values as a function of efficiency
 per Unit.                      level (see chapter 8 of the November
                                2022 Preliminary Analysis TSD).
Energy Price Trends..........  AEO 2023 projections to 2050 and
                                extrapolation thereafter.
Energy Site-to-Primary and     A time-series conversion factor based on
 FFC Conversion.                AEO 2023.
Discount Rate................  3 percent and 7 percent.
Present Year.................  2023.
------------------------------------------------------------------------

1. Product Efficiency Trends
    A key component of the NIA is the trend in energy efficiency 
projected for the no-new-standards case and each of the standards 
cases. Section IV.E.8 of this document describes how DOE developed an 
energy efficiency distribution for the no-new-standards case (which 
yields a shipment-weighted average efficiency) for each of the 
considered product classes for the year of anticipated compliance with 
an amended or new standard (2030). To project efficiencies for the no-
new-standards case, DOE used historical shipment data and current 
consumer furnace fan model availability by efficiency level (see 
chapter 8 of the November 2022 Preliminary Analysis TSD).
    To develop standards-case efficiency trends, DOE used a ``roll-up'' 
scenario to establish the shipment-weighted efficiency for the year 
that standards are assumed to become effective (2030). In this 
scenario, the market shares of products in the no-new-standards case 
that do not meet the standard under consideration would ``roll up'' to 
meet the new standard level, and the market share of products above the 
standard would remain unchanged.
2. National Energy Savings
    The NES analysis involves a comparison of national energy 
consumption of the considered products between each potential standards 
case (i.e., CSL) and the case with no new or amended energy 
conservation standards. DOE calculated the national energy consumption 
by multiplying the number of units (i.e., stock) of each product (by 
vintage or age) by the unit energy consumption (also by vintage). DOE 
calculated annual NES based on the difference in national energy 
consumption for the no-new-standards case and for each higher-
efficiency standards case. DOE estimated energy consumption and savings 
based on site energy and converted the electricity consumption and 
savings to primary energy (i.e., the energy consumed by power plants to 
generate site electricity) using annual conversion factors derived from 
AEO 2023. For natural gas and LPG, primary energy consumption is the 
same as site energy consumption. Cumulative energy savings are the sum 
of the NES for each year over the timeframe of the analysis.
    Use of higher-efficiency products is sometimes associated with a 
direct rebound effect, which refers to an increase in utilization of 
the product due to the increase in efficiency and reduction in 
operating cost. A rebound effect reduces the energy savings 
attributable to a standard. Where appropriate, DOE accounts for the 
direct rebound effect when estimating the NES from potential standards. 
In the October 2023 NOPD, DOE applied a rebound effect in the 
residential sector for those standards cases that require a BPM motor 
furnace fan for product classes that currently have an improved PSC 
motor standard. A rebound effect factor of 16 percent was determined by 
calculating the additional electricity use that is required from a 
doubling of the use of continuous fan circulation compared to the 
average use assumed in the energy use analysis.\53\ Although a lower 
value might be warranted, DOE preferred to be conservative and not risk 
understating the rebound effect. For commercial applications, DOE 
applied no rebound effect, a decision consistent with other recent 
energy conservation standards rulemakings.<SUP>54 55 56</SUP>
---------------------------------------------------------------------------

    \53\ DOE reviewed an evaluation report from Wisconsin that 
indicates that a considerable number of homeowners who purchase 
constant-airflow BPM furnaces significantly increase the frequency 
with which they operate their furnace fan subsequent to the 
installation of the constant-airflow BPM furnace. This report 
indicates that, on average, there is a doubling in the amount of 
continuous fan circulation use. DOE assumed that this doubling was 
the same for all types of furnace fans that had a significant 
decrease in energy use in the continuous fan circulation mode. 
(Evaluation report available at: www.focusonenergy.com/sites/default/files/emcfurnaceimpactassessment_evaluationreport.pdf) (last 
accessed August 26, 2024).
    \54\ DOE, Energy Conservation Program for Certain Industrial 
Equipment: Energy Conservation Standards for Small, Large, and Very 
Large Air-Cooled Commercial Package Air Conditioning and Heating 
Equipment and Commercial Warm Air Furnaces; Direct Final Rule. 81 FR 
2419 (Jan. 15, 2016) (Available at: www.regulations.gov/document/EERE-2013-BT-STD-0021-0055) (last accessed June 28, 2024).
    \55\ DOE, Energy Conservation Program: Energy Conservation 
Standards for Residential Boilers; Final Rule. 81 FR 2319 (Jan. 15, 
2016) (Available at: www.regulations.gov/document/EERE-2012-BT-STD-0047-0078) (last accessed June 11, 2024).
    \56\ DOE, Energy Conservation Program: Energy Conservation 
Standards for Commercial Packaged Boilers; Final Rule. 85 FR 1592 
(Jan. 10, 2020) (Available at: www.regulations.gov/document/EERE-2013-BT-STD-0030-0099) (last accessed June 11, 2024).
---------------------------------------------------------------------------

    DOE did not receive comments on rebound in response to the October 
2023 NOPD. Consequently, DOE maintained the same approach for this 
final determination.
    In 2011, in response to the recommendations of a committee on 
``Point-of-Use and Full-Fuel-Cycle Measurement Approaches to Energy 
Efficiency Standards'' appointed by the National Academy of Sciences, 
DOE announced its intention to use FFC measures of energy use and 
greenhouse gas and other emissions in the NIAs and emissions analyses 
included in future energy conservation standards rulemakings. 76 FR 
51281 (August 18, 2011). After evaluating the approaches

[[Page 84017]]

discussed in the August 18, 2011 notice, DOE published a statement of 
amended policy in which DOE explained its determination that EIA's 
National Energy Modeling System (``NEMS'') is the most appropriate tool 
for its FFC analysis and its intention to use NEMS for that purpose. 77 
FR 49701 (August 17, 2012). NEMS is a public domain, multi-sector, 
partial equilibrium model of the U.S. energy sector \57\ that EIA uses 
to prepare its Annual Energy Outlook. The FFC factors incorporate 
losses in production and delivery in the case of natural gas (including 
fugitive emissions) and additional energy used to produce and deliver 
the various fuels used by power plants. The approach used for deriving 
FFC measures of energy use and emissions is described in appendix 10B 
of the November 2022 Preliminary Analysis TSD.
---------------------------------------------------------------------------

    \57\ For more information on NEMS, refer to The National Energy 
Modeling System: An Overview May 2023, DOE/EIA (May 2023) (Available 
at: www.eia.gov/outlooks/archive/0581(2023).pdf) (last accessed June 
11, 2024).
---------------------------------------------------------------------------

3. Net Present Value Analysis
    The inputs for determining the NPV of the total costs and benefits 
experienced by consumers are: (1) total annual installed cost, (2) 
total annual operating costs (which include energy costs and repair and 
maintenance costs), and (3) a discount factor to calculate the present 
value of costs and savings. DOE calculates net savings each year as the 
difference between the no-new-standards case and each standards case in 
terms of total savings in operating costs versus total increases in 
installed costs. DOE calculates operating cost savings over the 
lifetime of each product shipped during the projection period.
    The operating cost savings are energy cost savings, which are 
calculated using the estimated energy savings in each year and the 
projected price of the appropriate form of energy. To estimate energy 
prices in future years, DOE multiplied the average regional energy 
prices by the projection of annual national-average residential energy 
price changes in the AEO 2023 Reference case, which has an end year of 
2050. To estimate price trends after 2050, DOE used the average annual 
rate of change in prices from 2020 through 2050.
    In calculating the NPV, DOE multiplies the net savings in future 
years by a discount factor to determine their present value. For this 
final determination, DOE estimated the NPV of consumer benefits using 
both a 3-percent and a 7-percent real discount rate. DOE uses these 
discount rates in accordance with guidance provided by the Office of 
Management and Budget (``OMB'') to Federal agencies on the development 
of regulatory analysis.\58\ The discount rates for the determination of 
NPV are in contrast to the discount rates used in the LCC analysis, 
which are designed to reflect a consumer's perspective. The 7-percent 
real value is an estimate of the average before-tax rate of return to 
private capital in the U.S. economy. The 3-percent real value 
represents the ``social rate of time preference,'' which is the rate at 
which society discounts future consumption flows to their present 
value. DOE did not receive comments regarding the NIA methodology in 
response to the October 2023 NOPD.
---------------------------------------------------------------------------

    \58\ United States Office of Management and Budget, Circular A-
4: Regulatory Analysis (Sept. 17, 2003) Section E. (Available at: 
www.whitehouse.gov/omb/information-for-agencies/circulars) (last 
accessed June 28, 2024). DOE used the prior version of Circular A-4 
(September 17, 2003) in accordance with the effective date of the 
November 9, 2023 version (Available at: www.whitehouse.gov/wp-content/uploads/legacy_drupal_files/omb/circulars/A4/a-4.pdf) (last 
accessed June 28, 2024).
---------------------------------------------------------------------------

H. Other Factors Related to Backward-Inclined Impellers

    In this analysis, although DOE did not screen out backward-inclined 
impellers from further considerations in this analysis (for the reasons 
discussed in section IV.A.4.b of this document), DOE is aware of 
several points of uncertainty related to the impacts of a potential 
standard that would require the use of this technology. First, DOE 
understands that there may be uncertainty related to whether this 
technology can be implemented across all input capacities and cabinet 
sizes. Second, as discussed in the October 2023 NOPD, manufacturers 
raised concerns about the potential negative impacts on consumer 
features because of increased noise in certain sizes of furnaces 
(although DOE is not aware of data on this subject). 88 FR 69826, 
69836, 69861 (Oct. 6, 2023). Additionally, the incorporation of 
backward-inclined impellers could require system changes to the furnace 
system that expand beyond the scope of the furnace fan. Manufacturers 
noted that adoption of backward-inclined impellers could necessitate 
system considerations to ensure reliability of heat exchanger 
performance, acceptable sound performance, and ease of installation. 
Manufacturers also raised concerns that constraints of backward-
inclined impeller designs could impede the flexibility of installation 
configurations, as discussed in the October 2023 NOPD. Id. For a 
fraction of the market, complete furnace redesign would be required to 
accommodate the backward-inclined impellers design option.
    Finally, as discussed in section IV.B.1.c of this document, DOE 
understands that there is uncertainty associated with the estimated 10-
percent reduction in FER for fans using a backward-inclined impeller as 
compared to models that include forward-inclined impellers. Uncertainty 
related to the results of the energy use analysis contributes 
uncertainty to all the conclusions of DOE's subsequent analyses, 
including the LCC and PBP analyses and the NIA.
    In commenting on the October 2023 NOPD, Ravnitzky supported DOE's 
consideration of unintended consequences such as limiting small 
cabinet-size options and increased noise associated with specific 
design options, including backward-inclined impellers, so as to ensure 
that standards did not limit the performance of consumer furnace fans 
or place excessive burden on manufacturers and consumers. (Ravnitzky, 
No. 29 at p. 1) Lennox commented that it agrees with DOE's conclusions 
that the limited number of backward-inclined impellers on the market, 
concerns about feasibility of implementing the technology across all 
input capacities and cabinet sizes, unavailability of certain furnace 
product sizes, and uncertainty of estimates of energy reduction 
associated with backward-inclined impellers suggest that amended 
standards may not be appropriate. (Lennox, No. 30 at pp. 2-3)
    In response, as discussed in section V.C of this document, DOE has 
considered these uncertainties in its decision of whether to amend the 
energy conservation standards for consumer furnace fans.

V. Analytical Results and Conclusions

    The following section addresses the results from DOE's analyses 
with respect to the considered energy conservation standards for 
consumer furnace fans. It addresses the CSLs examined by DOE (see 
section IV.B.1 of this document) and the projected impacts of each of 
these levels if adopted as energy conservation standards for the 
subject consumer furnace fans. To estimate the impacts of amended 
standards for consumer furnace fans, DOE compared the no-new-standards 
case to scenarios in which specific CSLs are implemented. CSL 1 
analyzes a scenario in which standards corresponding to EL 1 are 
adopted for the NWO-NC, MH-NWG-NC, MH-NWG-C, and MH-NWO product classes 
and standards are not amended for the NWG-NC, NWG-C,

[[Page 84018]]

WG-NC, NWEF/NWMB, and MH-EF/MB product classes. CSL 2 analyzes a 
scenario in which standards are adopted corresponding to EL 1 for the 
NWG-NC, NWG-C, WG-NC, NWEF/NWMB, and MH-EF/MB product classes and as EL 
2 for the NWO-NC, MH-NWG-NC, MH-NWG-C, and MH-NWO product classes. In 
other words, CSL 1 analyzes a scenario with standards set at a level at 
which BPM motors are effectively required for all product classes, and 
CSL 2 analyzes a scenario with standards set at a level at which BPM 
motors with backward-inclined impellers are effectively required for 
all product classes, corresponding to the max-tech efficiency level for 
all product classes. Additional details regarding DOE's analyses are 
contained in the November 2022 Preliminary Analysis TSD supporting this 
document.

A. Economic Impacts on Individual Consumers

    DOE analyzed the economic impacts on furnace fan consumers by 
looking at the effects that potential amended energy conservation 
standards at each EL would have on the LCC and PBP. This approach 
allowed DOE to assess the potential standards' cost-effectiveness 
(i.e., the savings in operating costs throughout the estimated average 
life of consumer furnace fans compared to any increase in the price of, 
or in the initial charges for, or maintenance expenses of, the consumer 
furnace fans that are likely to result from the imposition of a 
standard). These analyses are discussed in the following sections.
    In general, higher-efficiency products typically affect consumers 
in two ways: (1) purchase price increases, and (2) annual operating 
costs decrease. Inputs used for calculating the LCC and PBP include 
total installed costs (i.e., product price plus installation costs), 
and operating costs (i.e., annual energy use, energy prices, energy 
price trends, repair costs, and maintenance costs). The LCC calculation 
also uses product lifetime and a discount rate. Section IV.E of this 
final determination and chapter 8 of the November 2022 Preliminary 
Analysis TSD provide detailed information on the LCC and PBP analyses.
    Table V.1 through Table V.18 show the average LCC and PBP results 
for the ELs considered for each product class of consumer furnace fans. 
In the first of each pair of tables, the simple payback is measured 
relative to the baseline level. In the second table, the impacts are 
measured relative to the efficiency distribution in the no-new-
standards case in the compliance year. The LCC and PBP results for 
consumer furnace fans include both residential and commercial users. 
Because some consumers purchase products with higher efficiency in the 
no-new-standards case, the average savings are less than the difference 
between the average LCC of the baseline product and the average LCC at 
each EL. The savings refer only to consumers who are affected by a 
standard at a given EL. Those who already purchase products with 
efficiency at or above a given EL are not affected. Consumers for whom 
the LCC increases at a given EL experience a net cost.

                Table V.1--Average LCC and PBP Results by Efficiency Level for Non-Weatherized, Non-Condensing Gas Furnace Fans (NWG-NC)
--------------------------------------------------------------------------------------------------------------------------------------------------------
                                                                   Average costs (2022$)
                                       ----------------------------------------------------------------------------   Simple payback    Average lifetime
           Efficiency level                                   First year's         Lifetime                           period (years)        (years)
                                          Installed cost     operating cost     operating cost          LCC
--------------------------------------------------------------------------------------------------------------------------------------------------------
0.....................................                403                 67              1,160              1,563  .................               20.9
1.....................................                495                 60              1,069              1,565               12.9               20.9
--------------------------------------------------------------------------------------------------------------------------------------------------------
Note: The results for each EL are calculated assuming that all consumers use products at that efficiency level. The PBP is measured relative to the
  baseline product.


   Table V.2--Average LCC Savings Relative to the Base Case Efficiency Distribution for Non-Weatherized, Non-
                                      Condensing Gas Furnace Fans (NWG-NC)
----------------------------------------------------------------------------------------------------------------
                                                                        Percentage of        Average savings--
                         Efficiency level                             consumers with net     impacted consumers
                                                                             cost                (2022$) *
----------------------------------------------------------------------------------------------------------------
1.................................................................                  68.4                    (1)
----------------------------------------------------------------------------------------------------------------
* The savings represent the average LCC for affected consumers. Parentheses indicate negative (-) values.


                   Table V.3--Average LCC and PBP Results by Efficiency Level for Non-Weatherized, Condensing Gas Furnace Fans (NWG-C)
--------------------------------------------------------------------------------------------------------------------------------------------------------
                                                                   Average costs (2022$)
                                       ----------------------------------------------------------------------------   Simple payback    Average lifetime
           Efficiency level                                   First year's         Lifetime                           period (years)        (years)
                                          Installed cost     operating cost     operating cost          LCC
--------------------------------------------------------------------------------------------------------------------------------------------------------
0.....................................                420                 61              1,106              1,525  .................               21.9
1.....................................                501                 55              1,024              1,526               13.3               21.9
--------------------------------------------------------------------------------------------------------------------------------------------------------
Note: The results for each EL are calculated assuming that all consumers use products at that efficiency level. The PBP is measured relative to the
  baseline product.


[[Page 84019]]


Table V.4--Average LCC Savings Relative to the Base Case Efficiency Distribution for Non-Weatherized, Condensing
                                            Gas Furnace Fans (NWG-C)
----------------------------------------------------------------------------------------------------------------
                                                                        Percentage of        Average savings--
                         Efficiency level                             consumers with net     impacted consumers
                                                                             cost                (2022$) *
----------------------------------------------------------------------------------------------------------------
1.................................................................                  70.7                    (0)
----------------------------------------------------------------------------------------------------------------
* The savings represent the average LCC for affected consumers. Parentheses indicate negative (-) values.


         Table V.5--Average LCC and PBP Results by Efficiency Level for Mobile Home Non-Weatherized, Non-Condensing Gas Furnace Fans (MH-NWG-NC)
--------------------------------------------------------------------------------------------------------------------------------------------------------
                                                                   Average costs (2022$)
                                       ----------------------------------------------------------------------------   Simple payback    Average lifetime
           Efficiency level                                   First year's         Lifetime                           period (years)        (years)
                                          Installed cost     operating cost     operating cost          LCC
--------------------------------------------------------------------------------------------------------------------------------------------------------
0.....................................                212                 54                884              1,096  .................               20.7
1.....................................                258                 35                589                847                2.3               20.7
2.....................................                332                 30                530                863                5.0               20.7
--------------------------------------------------------------------------------------------------------------------------------------------------------
Note: The results for each EL are calculated assuming that all consumers use products at that efficiency level. The PBP is measured relative to the
  baseline product.


   Table V.6--Average LCC Savings Relative to the Base Case Efficiency
Distribution for Mobile Home Non-Weatherized, Non-Condensing Gas Furnace
                            Fans (MH-NWG-NC)
------------------------------------------------------------------------
                                  Percentage of       Average savings--
      Efficiency level         consumers with net    impacted consumers
                                      cost                (2022$) *
------------------------------------------------------------------------
1...........................                   3.8                   231
2...........................                  76.1                     9
------------------------------------------------------------------------
* The savings represent the average LCC for affected consumers.


           Table V.7--Average LCC and PBP Results by Efficiency Level for Mobile Home Non-Weatherized, Condensing Gas Furnace Fans (MH-NWG-C)
--------------------------------------------------------------------------------------------------------------------------------------------------------
                                                                   Average costs (2022$)
                                       ----------------------------------------------------------------------------   Simple payback    Average lifetime
           Efficiency level                                   First year's         Lifetime                           period (years)        (years)
                                          Installed cost     operating cost     operating cost          LCC
--------------------------------------------------------------------------------------------------------------------------------------------------------
0.....................................                238                 62              1,039              1,277  .................               21.5
1.....................................                300                 37                666                966                2.5               21.5
2.....................................                364                 34                631                995                4.6               21.5
--------------------------------------------------------------------------------------------------------------------------------------------------------
Note: The results for each EL are calculated assuming that all consumers use products at that efficiency level. The PBP is measured relative to the
  baseline product.


   Table V.8--Average LCC Savings Relative to the Base Case Efficiency
  Distribution for Mobile Home Non-Weatherized, Condensing Gas Furnace
                             Fans (MH-NWG-C)
------------------------------------------------------------------------
                                  Percentage of       Average savings--
      Efficiency level         consumers with net    impacted consumers
                                      cost                (2022$) *
------------------------------------------------------------------------
1...........................                   1.5                   292
2...........................                  82.1                   (7)
------------------------------------------------------------------------
* The savings represent the average LCC for affected consumers.
  Parentheses indicate negative (-) values.


               Table V.9--Average LCC and PBP Results by Efficiency Level for Mobile Home Electric Furnace/Modular Blower Fans (MH-EF/MB)
--------------------------------------------------------------------------------------------------------------------------------------------------------
                                                                   Average costs (2022$)
                                       ----------------------------------------------------------------------------   Simple payback    Average lifetime
           Efficiency level                                   First year's         Lifetime                           period (years)        (years)
                                          Installed cost     operating cost     operating cost          LCC
--------------------------------------------------------------------------------------------------------------------------------------------------------
0.....................................                255                 36                629                885  .................               20.7

[[Page 84020]]

 
1.....................................                315                 32                578                893               14.7               20.7
--------------------------------------------------------------------------------------------------------------------------------------------------------
Note: The results for each EL are calculated assuming that all consumers use products at that efficiency level. The PBP is measured relative to the
  baseline product.


   Table V.10--LCC Average Savings Relative to the Base Case Efficiency Distribution for Mobile Home Electric
                                     Furnace/Modular Blower Fans (MH-EF/MB)
----------------------------------------------------------------------------------------------------------------
                                                                        Percentage of        Average savings--
                         Efficiency level                             consumers with net     impacted consumers
                                                                             cost                (2022$) *
----------------------------------------------------------------------------------------------------------------
1.................................................................                  71.5                    (8)
----------------------------------------------------------------------------------------------------------------
* The savings represent the average LCC for affected consumers. Parentheses indicate negative (-) values.


                Table V.11--Average LCC and PBP Results by Efficiency Level for Non-Weatherized, Non-Condensing Oil Furnace Fans (NWO-NC)
--------------------------------------------------------------------------------------------------------------------------------------------------------
                                                                   Average costs (2022$)
                                       ----------------------------------------------------------------------------   Simple payback    Average lifetime
           Efficiency level                                   First year's         Lifetime                           period (years)        (years)
                                          Installed cost     operating cost     operating cost          LCC
--------------------------------------------------------------------------------------------------------------------------------------------------------
0.....................................                568                151              2,601              3,169  .................               22.2
1.....................................                654                110              1,940              2,594                2.1               22.2
2.....................................                765                103              1,840              2,605                4.1               22.2
--------------------------------------------------------------------------------------------------------------------------------------------------------
Note: The results for each EL are calculated assuming that all consumers use products at that efficiency level. The PBP is measured relative to the
  baseline product.


  Table V.12--Average LCC Savings Relative to the Base Case Efficiency
 Distribution for Non-Weatherized, Non-Condensing Oil Furnace Fans (NWO-
                                   NC)
------------------------------------------------------------------------
                                  Percentage of       Average savings--
      Efficiency level         consumers with net    impacted consumers
                                      cost                (2022$) *
------------------------------------------------------------------------
1...........................                   4.4                   618
2...........................                  52.2                   274
------------------------------------------------------------------------
* The savings represent the average LCC for affected consumers.


                  Table V.13--Average LCC and PBP Results by Efficiency Level for Weatherized, Non-Condensing Gas Furnace Fans (WG-NC)
--------------------------------------------------------------------------------------------------------------------------------------------------------
                                                                   Average costs (2022$)
                                       ----------------------------------------------------------------------------   Simple payback    Average lifetime
           Efficiency level                                   First year's         Lifetime                           period (years)        (years)
                                          Installed cost     operating cost     operating cost          LCC
--------------------------------------------------------------------------------------------------------------------------------------------------------
0.....................................                385                 81              1,322              1,706  .................               20.6
1.....................................                478                 71              1,188              1,666                9.1               20.6
--------------------------------------------------------------------------------------------------------------------------------------------------------
Note: The results for each EL are calculated assuming that all consumers use products at that efficiency level. The PBP is measured relative to the
  baseline product.


[[Page 84021]]


     Table V.14--Average LCC Savings Relative to the Base Case Efficiency Distribution for Weatherized, Non-
                                       Condensing Gas Furnace Fans (WG-NC)
----------------------------------------------------------------------------------------------------------------
                                                                        Percentage of        Average savings--
                         Efficiency level                             consumers with net     impacted consumers
                                                                             cost                (2022$) *
----------------------------------------------------------------------------------------------------------------
1.................................................................                  54.9                     40
----------------------------------------------------------------------------------------------------------------
* The savings represent the average LCC for affected consumers.


                      Table V.15--Average LCC and PBP Results by Efficiency Level for Electric Furnace/Modular Blowers (NWEF/NWMB)
--------------------------------------------------------------------------------------------------------------------------------------------------------
                                                                   Average costs (2022$)
                                       ----------------------------------------------------------------------------   Simple payback    Average lifetime
           Efficiency level                                   First year's         Lifetime                           period (years)        (years)
                                          Installed cost     operating cost     operating cost          LCC
--------------------------------------------------------------------------------------------------------------------------------------------------------
0.....................................                305                 43                726              1,031  .................               20.7
1.....................................                371                 39                673              1,045               16.0               20.7
--------------------------------------------------------------------------------------------------------------------------------------------------------
Note: The results for each EL are calculated assuming that all consumers use products at that efficiency level. The PBP is measured relative to the
  baseline product.


 Table V.16--Average LCC Savings Relative to the Base Case Efficiency Distribution for Electric Furnace/Modular
                                               Blowers (NWEF/NWMB)
----------------------------------------------------------------------------------------------------------------
                                                                        Percentage of        Average savings--
                         Efficiency level                             consumers with net     impacted consumers
                                                                             cost                (2022$) *
----------------------------------------------------------------------------------------------------------------
1.................................................................                  77.5                   (14)
----------------------------------------------------------------------------------------------------------------
* The savings represent the average LCC for affected consumers. Parentheses indicate negative (-) values.


        Table V.17--Average LCC and PBP Results by Efficiency Level for Mobile Home Non-Weatherized, Non-Condensing Oil Furnace Fans (MH-NWO-NC)
--------------------------------------------------------------------------------------------------------------------------------------------------------
                                                                   Average costs (2022$)
                                       ----------------------------------------------------------------------------   Simple payback    Average lifetime
           Efficiency level                                   First year's         Lifetime                           period (years)        (years)
                                          Installed cost     operating cost     operating cost          LCC
--------------------------------------------------------------------------------------------------------------------------------------------------------
0.....................................                491                 88              1,539              2,030  .................               22.5
1.....................................                541                 66              1,187              1,728                2.3               22.5
2.....................................                624                 61              1,105              1,729                5.0               22.5
--------------------------------------------------------------------------------------------------------------------------------------------------------
Note: The results for each EL are calculated assuming that all consumers use products at that efficiency level. The PBP is measured relative to the
  baseline product.


  Table V.18--Average LCC Savings Relative to the Base Case Efficiency
Distribution for Mobile Home Non-Weatherized, Non-Condensing Oil Furnace
                             Fan (MH-NWO-NC)
------------------------------------------------------------------------
                                  Percentage of       Average savings--
      Efficiency level         consumers with net    impacted consumers
                                      cost                (2022$) *
------------------------------------------------------------------------
1...........................                  21.0                   308
2...........................                  54.7                   276
------------------------------------------------------------------------
* The savings represent the average LCC for affected consumers.

B. National Impact Analysis

    This section presents DOE's estimates of the NES and the NPV of 
consumer benefits that would result from each of the CSLs considered as 
potential amended standards.
1. National Energy Savings
    To estimate the energy savings attributable to potential amended 
energy conservation standards for consumer furnace fans, DOE compared 
their energy consumption under the no-new-standards case to their 
anticipated energy consumption under each CSL. The savings are measured 
over the entire lifetime of products purchased during the 30-year 
period that begins in the year of anticipated compliance with amended 
standards (2030-2059).
    Table V.19 presents DOE's projections of the national energy 
savings for each CSL considered for the analysis. The savings were 
calculated using the

[[Page 84022]]

approach described in section IV.G.2 of this document.

   Table V.19--Cumulative National Energy Savings for Consumer Furnace
                       Fans; 30 Years of Shipments
                               [2030-2059]
------------------------------------------------------------------------
                                                     Candidate standards
                                                            level
                                                   ---------------------
                                                        1          2
------------------------------------------------------------------------
                                                           (quads)
                                                   ---------------------
Primary energy....................................      0.013      1.355
FFC energy........................................      0.013      1.374
------------------------------------------------------------------------

    OMB Circular A-4 \59\ requires agencies to present analytical 
results, including separate schedules of the monetized benefits and 
costs that show the type and timing of benefits and costs. Circular A-4 
also directs agencies to consider the variability of key elements 
underlying the estimates of benefits and costs. For this final 
determination, DOE undertook a sensitivity analysis using nine years, 
rather than 30 years, of product shipments. The choice of a nine-year 
period is a proxy for the timeline in EPCA for the review of certain 
energy conservation standards and potential revision of and compliance 
with such revised standards.\60\ The review timeframe established in 
EPCA is generally not synchronized with the product lifetime, product 
manufacturing cycles, or other factors specific to consumer furnace 
fans. Thus, such results are presented for informational purposes only 
and are not indicative of any change in DOE's analytical methodology. 
The NES sensitivity analysis results based on a nine-year analytical 
period are presented in Table V.20. The impacts are counted over the 
lifetime of consumer furnace fans purchased during the period 2030-
2038.
---------------------------------------------------------------------------

    \59\ U.S. Office of Management and Budget, Circular A-4: 
Regulatory Analysis (Available at: www.whitehouse.gov/omb/information-for-agencies/circulars) (last accessed Sept. 9, 2021). 
DOE used the prior version of Circular A-4 (Sept. 17, 2003) in 
accordance with the effective date of the November 9, 2023 version 
(Available at: www.whitehouse.gov/wp-content/uploads/legacy_drupal_files/omb/circulars/A4/a-4.pdf) (last accessed June 
11, 2024).
    \60\ EPCA requires DOE to review its standards at least once 
every six years, and requires, for certain products, a three-year 
period after any new standard is promulgated before compliance is 
required, except that in no case may any new standards be required 
within six years of the compliance date of the previous standards. 
(42 U.S.C. 6295(m)) If DOE makes a determination that amended 
standards are not needed, it must conduct a subsequent review within 
three years following such a determination. As DOE is evaluating the 
need to amend the standards, the sensitivity analysis is based on 
the review timeframe associated with amended standards. While adding 
a six-year review to the three-year compliance period adds up to 
nine years, DOE notes that it may undertake reviews at any time 
within the six-year period and that the three-year compliance date 
may yield to the six-year backstop. A nine-year analysis period may 
not be appropriate given the variability that occurs in the timing 
of standards reviews and the fact that for some products, the 
compliance period is five years rather than three years.

   Table V.20--Cumulative National Energy Savings for Consumer Furnace
                       Fans; 9 Years of Shipments
                               [2030-2038]
------------------------------------------------------------------------
                                                     Candidate standards
                                                            level
                                                   ---------------------
                                                        1          2
------------------------------------------------------------------------
                                                           (quads)
                                                   ---------------------
Primary energy....................................      0.005      0.376
FFC energy........................................      0.005      0.381
------------------------------------------------------------------------

2. Net Present Value of Consumer Costs and Benefits
    DOE estimated the cumulative NPV of the total costs and savings for 
consumers that would result from the CSLs considered for consumer 
furnace fans. In accordance with OMB Circular A-4, DOE calculated NPV 
using both a 7-percent and a 3-percent real discount rate. Table V.21 
shows the consumer NPV results with impacts counted over the lifetime 
of products purchased during the period 2030-2059.

    Table V.21--Cumulative Net Present Value of Consumer Benefits for
              Consumer Furnace Fans; 30 Years of Shipments
                               [2030-2059]
------------------------------------------------------------------------
                                                     Candidate standards
                                                            level
                   Discount rate                   ---------------------
                                                        1          2
------------------------------------------------------------------------
                                                       (billion 2022$)
                                                   ---------------------
3 percent.........................................      0.112      1.821
7 percent.........................................      0.042    (0.150)
------------------------------------------------------------------------
Note: Parentheses indicate negative (-) values.

    The NPV results based on the aforementioned nine-year analytical 
period are presented in Table V.22. The impacts are counted over the 
lifetime of consumer furnace fan products purchased during the period 
2030-2038. As mentioned previously, such results are presented for 
informational purposes only and are not indicative of any change in 
DOE's analytical methodology or decision criteria.

    Table V.22--Cumulative Net Present Value of Consumer Benefits for
               Consumer Furnace Fans; 9 Years of Shipments
                               [2030-2038]
------------------------------------------------------------------------
                                                     Candidate standards
                                                            level
                   Discount rate                   ---------------------
                                                        1          2
------------------------------------------------------------------------
                                                       (billion 2022$)
                                                   ---------------------
3 percent.........................................      0.056      0.716
7 percent.........................................      0.026    (0.071)
------------------------------------------------------------------------
Note: Parentheses indicate negative (-) values.

C. Final Determination

    As discussed previously, in order to make a final determination 
that the energy conservation standards for consumer furnace fans do not 
need to be amended, EPCA requires that DOE analyze whether amended 
standards would result in significant conservation of energy, be 
technologically feasible, and be cost-effective. (42 U.S.C. 
6295(m)(1)(A) and 42 U.S.C. 6295(n)(2))
    DOE has determined that technology options are available that can 
improve the efficacy of consumer furnace fans. These technology options 
are being used in commercially-available consumer furnace fans and, 
therefore, are technologically feasible. (See section IV.A.4 of this 
document for further information.) Hence, DOE has determined that 
amended energy conservation standards for consumer furnace fans would 
be technologically feasible.
    Under 42 U.S.C. 6295(o)(2)(B)(i)(II), an evaluation of cost-
effectiveness requires DOE to consider savings in operating costs 
throughout the estimated average life of the covered product in the 
type (or class) compared to any increase in the price, initial charges, 
or maintenance expenses for the covered product that are likely to 
result from the standard. (42 U.S.C. 6295(n)(2)(C) and 42 U.S.C. 
6295(o)(2)(B)(i)(II)) DOE conducted an LCC analysis to estimate the net 
costs/benefits to users from increased efficiency in the considered 
consumer furnace fan product classes, the results of which are shown in 
Table V.1 through Table V.18. DOE then aggregated the results from the 
LCC analysis to estimate the NPV of the total costs and benefits 
experienced by the Nation. (See results in Table V.21.) As noted, the 
inputs for determining the NPV are: (1) total annual installed cost, 
(2) total annual operating costs (energy costs and repair and 
maintenance costs),

[[Page 84023]]

and (3) a discount factor to calculate the present value of costs and 
savings.
    EPCA also requires that DOE consider whether amended energy 
conservation standards for the subject consumer furnace fans would 
result in significant conservation of energy. (42 U.S.C. 6295(m)(1)(A) 
and 42 U.S.C. 6295(n)(2)(A)) To estimate the energy savings 
attributable to potential amended standards for consumer furnace fans, 
DOE compared their energy consumption under the no-new-standards case 
to their anticipated energy consumption under each potential standard 
level. The savings are measured over the entire lifetime of products 
purchased in the 30-year period that begins in the year of anticipated 
compliance with amended standards (2030-2059). The results of this 
analysis are shown in Table V.19.
    Because an analysis of potential cost-effectiveness and energy 
savings first requires an evaluation of the relevant technology, DOE 
typically first discusses the technological feasibility of amended 
standards. DOE then typically addresses the cost-effectiveness and 
energy savings associated with potential amended standards. For this 
final determination, DOE reviewed the impacts of amended standards 
corresponding to the implementation of the two design options analyzed 
in this proceeding separately (i.e., BPM motor with forward-curved 
impellers and BPM motor with backward-inclined impellers, as discussed 
in section IV.B.1 of this document). For each design option, DOE 
considered the technological feasibility, cost-effectiveness, and 
significance of energy savings.
1. BPM Motor With Backward-Inclined Impellers
    BPM motors with backward-inclined impellers are included in the 
current analysis as the max-tech design option for all furnace fan 
product classes. In other words, they are analyzed as EL 1 for the NWG-
NC, NWG-C, WG-NC, NWEF/NWMB, and MH-EF/MB product classes and as EL 2 
for the NWO-NC, MH-NWG-NC, MH-NWG-C, and MH-NWO product classes. As 
discussed in section IV.A.4 of this document, DOE is aware of BPM 
motors with backward-inclined impellers being used in commercially-
available consumer furnace fans, and, therefore, this technology is 
technologically feasible.
    As seen in Table V.19, DOE estimates that amended standards for 
consumer furnace fans would result in FFC energy savings of 1.374 quads 
at max-tech levels over a 30-year analysis period (2030-2059). However, 
as seen in Table V.1 through Table V.18 and Table V.21, these 
efficiency levels result in net LCC costs for the majority of consumers 
and negative net present value at a 7-percent discount rate. Therefore, 
DOE finds that the max-tech ELs (which would require the use of 
backward-inclined impellers) are not cost-effective.
    Additionally, as discussed in section IV.H of this document, there 
is a significant amount of uncertainty associated with the inputs and 
results of this analysis. At this time, DOE has concerns about the 
feasibility of implementing backward-inclined impellers across all 
input capacities and cabinet sizes and the unavailability of certain 
furnace product sizes, concerns about potential negative impacts on 
consumer features, and uncertainty related to its assumptions about the 
energy reduction associated with backward-inclined impellers as opposed 
to forward-curved impellers.
2. BPM Motors With Forward-Inclined Impellers
    BPM motors with forward-curved impellers (which is the type of 
impeller used in the vast majority of consumer furnace fans on the 
market today) are included in the current analysis as the design option 
analyzed in CSL 1. For these product classes, the current standards can 
be met using less-efficient PSC motors, so replacing the motor with a 
BPM motor can improve the efficiency of the furnace fan. BPM motors are 
widely used in commercially-available consumer furnace fans and, 
therefore, are technologically feasible.
    As seen in Table V.21, CSL 1 results in positive NPV at the 3-
percent and 7-percent discount rates. And, as seen in Table V.19, DOE 
estimates that amended standards for consumer furnace fans would result 
in energy savings of 0.013 quads at CSL 1 over a 30-year analysis 
period (2030-2059). However, as discussed in section IV.F of this 
document, shipments in the affected product classes have declined over 
the past 20 years and could decline faster than current shipment 
projections, which may lead to reductions in energy savings from 
amended standards. Given the small role of NWO-NC, MH-NWG-NC, MH-NWG-C, 
and MH-NWO in the overall furnace market and the low sales relative to 
the consumer boiler and consumer water heater markets, manufacturers 
may deprioritize furnace fan updates for these product classes. 
Depending on how companies prioritize resources, there could be reduced 
availability of NWO-NC, MH-NWG-NC, and MH-NWO products in the 
marketplace after 2030. Additionally, there is a potential risk that 
some manufacturers would choose to exit these markets rather than 
redesign affected products, given the low shipment volumes, lack of 
anticipated growth, limited potential for cost recovery, and need to 
prioritize technical resources. In particular, the loss of a few 
manufacturers in the NWO-NC market could lead to changes in competition 
and shifts toward the market becoming highly concentrated. Based on the 
declining shipments of the affected product classes and uncertainty 
over whether manufacturers will choose to remain in a shrinking market, 
DOE has determined that it is unable to conclude that amended standards 
for consumer furnace fans would be economically justified.
3. Summary
    As discussed previously, a determination that amended standards are 
not needed must be based on consideration of whether amended standards 
will result in significant conservation of energy, are technologically 
feasible, and are cost-effective. (42 U.S.C. 6295(m)(1)(A) and 42 
U.S.C. 6295(n)(2)) Additionally, DOE can only propose an amended 
standards if it is, among other things, economically justified. (42 
U.S.C. 6295(m)(1)(B); 42 U.S.C. 6295(o)(2)(A)) However, for the reasons 
discussed in the preceding sections, DOE is unable to conclude that 
amended standards for furnace fans at any of the CSLs analyzed would 
result in significant conservation of energy, be technologically 
feasible, and also be cost-effective. Therefore, DOE has determined 
that energy conservation standards for consumer furnace fans do not 
need to be amended at this time.

VI. Procedural Issues and Regulatory Review

A. Review Under Executive Orders 12866, 13563, and 14094

    Executive Order (``E.O.'') 12866, ``Regulatory Planning and 
Review,'' 58 FR 51735 (Oct. 4, 1993), as supplemented and reaffirmed by 
E.O. 13563, ``Improving Regulation and Regulatory Review,'' 76 FR 3821 
(Jan. 21, 2011) and amended by E.O. 14094, ``Modernizing Regulatory 
Review,'' 88 FR 21879 (April 11, 2023), requires agencies, to the 
extent permitted by law, to: (1) propose or adopt a regulation only 
upon a reasoned determination that its benefits justify its costs 
(recognizing that some benefits and costs are difficult to quantify); 
(2) tailor regulations to impose the least burden

[[Page 84024]]

on society, consistent with obtaining regulatory objectives, taking 
into account, among other things, and to the extent practicable, the 
costs of cumulative regulations; (3) select, in choosing among 
alternative regulatory approaches, those approaches that maximize net 
benefits (including potential economic, environmental, public health 
and safety, and other advantages; distributive impacts; and equity); 
(4) to the extent feasible, specify performance objectives, rather than 
specifying the behavior or manner of compliance that regulated entities 
must adopt; and (5) identify and assess available alternatives to 
direct regulation, including providing economic incentives to encourage 
the desired behavior, such as user fees or marketable permits, or 
providing information upon which choices can be made by the public. DOE 
emphasizes as well that E.O. 13563 requires agencies to use the best 
available techniques to quantify anticipated present and future 
benefits and costs as accurately as possible. In its guidance, the 
Office of Information and Regulatory Affairs (``OIRA'') in the OMB has 
emphasized that such techniques may include identifying changing future 
compliance costs that might result from technological innovation or 
anticipated behavioral changes. For the reasons stated in this 
preamble, this final regulatory action is consistent with these 
principles.
    Section 6(a) of E.O. 12866 also requires agencies to submit 
``significant regulatory actions'' to OIRA for review. OIRA has 
determined that this final regulatory action does not constitute a 
``significant regulatory action'' under section 3(f) of E.O. 12866, as 
amended by E.O. 14094. Accordingly, this action was not submitted to 
OIRA for review under E.O. 12866.

B. Review Under the Regulatory Flexibility Act

    The Regulatory Flexibility Act (5 U.S.C. 601 et seq.) requires 
preparation of an initial regulatory flexibility analysis (``IRFA'') 
and a final regulatory flexibility analysis (``FRFA'') for any rule 
that by law must be proposed for public comment, unless the agency 
certifies that the rule, if promulgated, will not have a significant 
economic impact on a substantial number of small entities. As required 
by E.O. 13272, ``Proper Consideration of Small Entities in Agency 
Rulemaking,'' 67 FR 53461 (August 16, 2002), DOE published procedures 
and policies in the Federal Register on February 19, 2003, to ensure 
that the potential impacts of its rules on small entities are properly 
considered during the rulemaking process. 68 FR 7990. DOE has made its 
procedures and policies available on the Office of the General 
Counsel's website (www.energy.gov/gc/office-general-counsel).
    DOE reviewed this final determination under the provisions of the 
Regulatory Flexibility Act and the policies and procedures published on 
February 19, 2003. Because DOE is not amending standards for consumer 
furnace fans, the determination will not amend any energy conservation 
standards. On the basis of the foregoing, DOE certifies that the final 
determination will have no significant economic impact on a substantial 
number of small entities. Accordingly, DOE has not prepared an FRFA for 
this final determination. DOE has transmitted this certification and 
supporting statement of factual basis to the Chief Counsel for Advocacy 
of the Small Business Administration for review under 5 U.S.C. 605(b).

C. Review Under the Paperwork Reduction Act of 1995

    This final determination, which concludes that no amended energy 
conservation standards for consumer furnace fans are needed, imposes no 
new informational or recordkeeping requirements. Accordingly, OMB 
clearance is not required under the Paperwork Reduction Act. (44 U.S.C. 
3501 et seq.)

D. Review Under the National Environmental Policy Act of 1969

    DOE has analyzed this final action in accordance with the National 
Environmental Policy Act of 1969 (``NEPA'') and DOE's NEPA implementing 
regulations (10 CFR part 1021). DOE's regulations include a categorical 
exclusion for actions which are interpretations or rulings with respect 
to existing regulations. 10 CFR part 1021, subpart D, appendix A4. DOE 
has determined that this rule qualifies for categorical exclusion A4 
because it is an interpretation or ruling in regard to an existing 
regulation and otherwise meets the requirements for application of a 
categorical exclusion. See 10 CFR 1021.410. Accordingly, neither an 
environmental assessment nor an environmental impact statement is 
required.

E. Review Under Executive Order 13132

    E.O. 13132, ``Federalism,'' 64 FR 43255 (August 10, 1999), imposes 
certain requirements on Federal agencies formulating and implementing 
policies or regulations that preempt State law or that have federalism 
implications. The Executive order requires agencies to examine the 
constitutional and statutory authority supporting any action that would 
limit the policymaking discretion of the States and to carefully assess 
the necessity for such actions. The Executive order also requires 
agencies to have an accountable process to ensure meaningful and timely 
input by State and local officials in the development of regulatory 
policies that have federalism implications. On March 14, 2000, DOE 
published a statement of policy describing the intergovernmental 
consultation process it will follow in the development of such 
regulations. 65 FR 13735. DOE has examined this final determination and 
has determined that it would not have a substantial direct effect on 
the States, on the relationship between the national government and the 
States, or on the distribution of power and responsibilities among the 
various levels of government. EPCA governs and prescribes Federal 
preemption of State regulations as to energy conservation for the 
products that are the subject of this final determination. States can 
petition DOE for exemption from such preemption to the extent, and 
based on criteria, set forth in EPCA. (42 U.S.C. 6297) Therefore, no 
further action is required by E.O. 13132.

F. Review Under Executive Order 12988

    With respect to the review of existing regulations and the 
promulgation of new regulations, section 3(a) of E.O. 12988, ``Civil 
Justice Reform,'' 61 FR 4729 (Feb. 7, 1996), imposes on Federal 
agencies the general duty to adhere to the following requirements: (1) 
eliminate drafting errors and ambiguity; (2) write regulations to 
minimize litigation; (3) provide a clear legal standard for affected 
conduct rather than a general standard, and (4) promote simplification 
and burden reduction. Regarding the review required by section 3(a), 
section 3(b) of E.O. 12988 specifically requires that Executive 
agencies make every reasonable effort to ensure that the regulation: 
(1) clearly specifies the preemptive effect, if any; (2) clearly 
specifies any effect on existing Federal law or regulation; (3) 
provides a clear legal standard for affected conduct while promoting 
simplification and burden reduction; (4) specifies the retroactive 
effect, if any; (5) adequately defines key terms, and (6) addresses 
other important issues affecting clarity and general draftsmanship 
under any guidelines issued by the Attorney General. Section 3(c) of 
E.O. 12988 requires Executive agencies to review regulations in light 
of

[[Page 84025]]

applicable standards in section 3(a) and section 3(b) to determine 
whether they are met or it is unreasonable to meet one or more of them. 
DOE has completed the required review and determined that, to the 
extent permitted by law, this final determination meets the relevant 
standards of E.O. 12988.

G. Review Under the Unfunded Mandates Reform Act of 1995

    Title II of the Unfunded Mandates Reform Act of 1995 (``UMRA'') 
requires each Federal agency to assess the effects of Federal 
regulatory actions on State, local, and Tribal governments and the 
private sector. Public Law 104-4, sec. 201 (codified at 2 U.S.C. 1531). 
For a regulatory action likely to result in a rule that may cause the 
expenditure by State, local, and Tribal governments, in the aggregate, 
or by the private sector of $100 million or more in any one year 
(adjusted annually for inflation), section 202 of UMRA requires a 
Federal agency to publish a written statement that estimates the 
resulting costs, benefits, and other effects on the national economy. 
(2 U.S.C. 1532(a), (b)) UMRA also requires a Federal agency to develop 
an effective process to permit timely input by elected officers of 
State, local, and Tribal governments on a proposed ``significant 
intergovernmental mandate,'' and requires an agency plan for giving 
notice and opportunity for timely input to potentially affected small 
governments before establishing any requirements that might 
significantly or uniquely affect them. On March 18, 1997, DOE published 
a statement of policy on its process for intergovernmental consultation 
under UMRA. 62 FR 12820. DOE's policy statement is also available at 
www.energy.gov/sites/prod/files/gcprod/documents/umra_97.pdf.
    DOE examined this final determination according to UMRA and its 
statement of policy and determined that the final determination does 
not contain a Federal intergovernmental mandate, nor is it expected to 
require expenditures of $100 million or more in any one year by State, 
local, and Tribal governments, in the aggregate, or by the private 
sector. As a result, the analytical requirements of UMRA do not apply.

H. Review Under the Treasury and General Government Appropriations Act, 
1999

    Section 654 of the Treasury and General Government Appropriations 
Act, 1999 (Pub. L. 105-277) requires Federal agencies to issue a Family 
Policymaking Assessment for any proposed rule or policy that may affect 
family well-being. When developing a Family Policymaking Assessment, 
agencies must assess whether: (1) the action strengthens or erodes the 
stability or safety of the family and, particularly, the marital 
commitment; (2) the action strengthens or erodes the authority and 
rights of parents in the education, nurture, and supervision of their 
children; (3) the action helps the family perform its functions, or 
substitutes governmental activity for the function; (4) the action 
increases or decreases disposable income or poverty of families and 
children; (5) the proposed benefits of the action justify the financial 
impact on the family; (6) the action may be carried out by State or 
local government or by the family, and whether (7) the action 
establishes an implicit or explicit policy concerning the relationship 
between the behavior and personal responsibility of youth, and the 
norms of society. In evaluating the above factors, DOE has concluded 
that it is not necessary to prepare a Family Policymaking Assessment as 
none of the above factors are implicated. Further, this final 
determination would not have any financial impact on families nor any 
impact on the autonomy or integrity of the family as an institution.

I. Review Under Executive Order 12630

    Pursuant to E.O. 12630, ``Governmental Actions and Interference 
with Constitutionally Protected Property Rights,'' 53 FR 8859 (March 
18, 1988), DOE has determined that this final determination would not 
result in any takings that might require compensation under the Fifth 
Amendment to the U.S. Constitution.

J. Review Under the Treasury and General Government Appropriations Act, 
2001

    Section 515 of the Treasury and General Government Appropriations 
Act, 2001 (44 U.S.C. 3516 note) provides for Federal agencies to review 
most disseminations of information to the public under information 
quality guidelines established by each agency pursuant to general 
guidelines issued by OMB. OMB's guidelines were published at 67 FR 8452 
(Feb. 22, 2002), and DOE's guidelines were published at 67 FR 62446 
(Oct. 7, 2002). Pursuant to OMB Memorandum M-19-15, ``Improving 
Implementation of the Information Quality Act'' (April 24, 2019), DOE 
published updated guidelines, which are available at www.energy.gov/sites/prod/files/2019/12/f70/DOE%20Final%20Updated%20IQA%20Guidelines%20Dec%202019.pdf. DOE has 
reviewed this final determination under the OMB and DOE guidelines and 
has concluded that it is consistent with applicable policies in those 
guidelines.

K. Review Under Executive Order 13211

    E.O. 13211, ``Actions Concerning Regulations That Significantly 
Affect Energy Supply, Distribution, or Use,'' 66 FR 28355 (May 22, 
2001), requires Federal agencies to prepare and submit to OIRA at OMB a 
Statement of Energy Effects for any proposed significant energy action. 
A ``significant energy action'' is defined as any action by an agency 
that promulgates or is expected to lead to promulgation of a final 
rule, and that: (1) is a significant regulatory action under Executive 
Order 12866, or any successor order, and is likely to have a 
significant adverse effect on the supply, distribution, or use of 
energy; or (2) is designated by the Administrator of OIRA as a 
significant energy action. For any significant energy action, the 
agency must give a detailed statement of any adverse effects on energy 
supply, distribution, or use should the proposal be implemented, and of 
reasonable alternatives to the action and their expected benefits on 
energy supply, distribution, and use.
    This final determination, which does not amend energy conservation 
standards for consumer furnace fans, is not a significant regulatory 
action under E.O. 12866. Moreover, it would not have a significant 
adverse effect on the supply, distribution, or use of energy, nor has 
it been designated as such by the Administrator at OIRA. Therefore, it 
is not a significant energy action, and accordingly, DOE has not 
prepared a Statement of Energy Effects.

L. Review Under the Information Quality Bulletin for Peer Review

    On December 16, 2004, OMB, in consultation with the Office of 
Science and Technology Policy (``OSTP''), issued its Final Information 
Quality Bulletin for Peer Review (``the Bulletin''). 70 FR 2664 (Jan. 
14, 2005). The Bulletin establishes that certain scientific information 
shall be peer reviewed by qualified specialists before it is 
disseminated by the Federal Government, including influential 
scientific information related to agency regulatory actions. The 
purpose of the bulletin is to enhance the quality and credibility of 
the Government's scientific information. Under the Bulletin, the energy 
conservation standards rulemaking analyses are ``influential scientific 
information,'' which the Bulletin defines as ``scientific information 
the agency reasonably can determine will have, or does have, a clear 
and substantial impact on

[[Page 84026]]

important public policies or private sector decisions.'' Id. at 70 FR 
2667.
    In response to OMB's Bulletin, DOE conducted formal peer reviews of 
the energy conservation standards development process and the analyses 
that are typically used and has prepared a peer review report 
pertaining to the energy conservation standards rulemaking 
analyses.\61\ Generation of this report involved a rigorous, formal, 
and documented evaluation using objective criteria and qualified and 
independent reviewers to make a judgment as to the technical/
scientific/business merit, the actual or anticipated results, and the 
productivity and management effectiveness of programs and/or projects. 
Because available data, models, and technological understanding have 
changed since 2007, DOE has engaged with the National Academy of 
Sciences (``NAS'') to review DOE's analytical methodologies to 
ascertain whether modifications are needed to improve DOE's analyses. 
DOE is in the process of evaluating the resulting December 2021 
report.\62\
---------------------------------------------------------------------------

    \61\ ``Energy Conservation Standards Rulemaking Peer Review 
Report'' (2007) (Available at: www.energy.gov/eere/buildings/downloads/energy-conservation-standards-rulemaking-peer-review-report-0) (last accessed June 28, 2024).
    \62\ The December 2021 NAS report is available at 
www.nationalacademies.org/our-work/review-of-methods-for-setting-building-and-equipment-performance-standards (Last accessed August 
28, 2024).
---------------------------------------------------------------------------

M. Congressional Notification

    As required by 5 U.S.C. 801, DOE will report to Congress on the 
promulgation of this final determination prior to its effective date. 
The Office of Information and Regulatory Affairs has determined that 
this rule does not meet the criteria set forth in 5 U.S.C. 804(2).

VII. Approval of the Office of the Secretary

    The Secretary of Energy has approved publication of this final 
determination.

Signing Authority

    This document of the Department of Energy was signed on October 10, 
2024, by Jeffrey Marootian, Principal Deputy Assistant Secretary for 
Energy Efficiency and Renewable Energy, pursuant to delegated authority 
from the Secretary of Energy. That document with the original signature 
and date is maintained by DOE. For administrative purposes only, and in 
compliance with requirements of the Office of the Federal Register, the 
undersigned DOE Federal Register Liaison Officer has been authorized to 
sign and submit the document in electronic format for publication, as 
an official document of the Department of Energy. This administrative 
process in no way alters the legal effect of this document upon 
publication in the Federal Register.

    Signed in Washington, DC, on October 10, 2024.
Treena V. Garrett,
Federal Register Liaison Officer, U.S. Department of Energy.
[FR Doc. 2024-23907 Filed 10-17-24; 8:45 am]
BILLING CODE 6450-01-P


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