PROPOSED January 22, 2015 

4905 - 1 Proposed Amendments to Rule 4905 

RULE 4905 NATURAL GAS-FIRED, FAN-TYPE RESIDENTIAL CENTRAL 

FURNACES (Adopted October 20, 2005, Amended January 22, 2015) 

1.0 Purpose 

 The purpose of this rule is to limit NOx emissions from natural gas-fired, fan-type 

residential central furnaces. 

2.0 Applicability 

The provisions of this rule shall apply to any person who supplies, sells, offers for sale, 

installs, or solicits the installation of natural gas-fired, fan-type residential central 

furnaces for use within the District San Joaquin Valley Air Basin with a rated heat input 

capacity of less than 175,000 British thermal units per hour, and for combination 

heating and cooling units with a rated cooling capacity of less than 65,000 British 

thermal units per hour. 

3.0 Definitions 

3.1 Air Pollution Control Officer (APCO): as defined in Rule 1020 (Definitions). 

3.2 Annual Fuel Utilization Efficiency: the efficiency descriptor as defined by 

Section 430.2 of the Code of Federal Regulations, Title 10, Part 430, Subpart 

A. 

3.3 Condensing Unit: for purposes of this rule, a natural gas-fired, fan-type central 

furnace, as defined in Section 3.5, that uses a second heat exchanger to extract 

the latent heat in the flue gas by cooling the combustion gasses to near ambient 

temperature so that water vapor condenses in the heat exchanger, is collected, 

and is drained. 

3.43 District: as defined in Rule 1020 (Definitions). 

3.54 Fan-type Residential Central Furnace: a self-contained space heater providing 

for circulation of heated air at pressures other than atmospheric through ducts 

more than 10 inches in length. 

3.65 Heat Output (Central Furnace): the product obtained by multiplying the annual 

fuel utilization efficiency as defined by Section 430.2 of the Code of Federal 

Regulations (CFR), Title 10, Part 430, Subpart A, by the rated heat input 

capacity of the natural gas-fired, fan-type central furnace. 

3.76 Manufactured Home: as defined in 42 United States Code Section 5402 and 

California Health and Safety Code Section 18007., means a structure, 
 PROPOSED January 22, 2015 

4905 - 2 Proposed Amendments to Rule 4905 

transportable in one or more sections, which, in the traveling mode, is eight 

body feet or more in width, or 40 body feet or more in length, or, when erected 

on site, is 320 or more square feet, and which is built on a permanent chassis 

and designed to be used as a dwelling with or without a permanent foundation 

when connected to the required utilities, and includes the plumbing, heating, air 

conditioning, and electrical systems contained therein; except that such term 

shall include any structure which meets all the requirements of this paragraph 

except the size requirements and with respect to which the manufacturer 

voluntarily files a certification and complies with the standards established under 

this part. "Manufactured home" includes a mobile home subject to the National 

Manufactured Housing Construction and Safety Act of 1974 (42 U.S.C., Sec. 

5401, et seq.). 

3.87 Natural Gas: a mixture of gaseous hydrocarbons containing at least 80 percent 

methane by volume, as determined according to Standard Method ASTM 

D1945-64. 

3.98 NOx: any oxides of nitrogen. 

3.109 Rated Cooling Capacity: the cooling capacity specified on the nameplate of the 

cooling unit. Cooling capacity is the amount of heat energy the cooling system 

can displace in one hour (British thermal units per hour), as specified on the 

rating plate of the cooling unit. 

3.110 Rated Heat Input Capacity: the heat input capacity specified on the nameplate 

of the combustion unit. Heat input is the amount of energy consumed in one 

hour (British thermal units per hour), as specified on the rating plate of the 

combustion unit. 

3.12 Responsible Official: for the purposes of this rule: for a corporation, a 

president or vice-president of the corporation in charge of a principal business 

function or a duly authorized person who performs similar policy-making 

functions; for a partnership or sole proprietorship, a general partner or 

proprietor, respectively. 

3.13 Weatherized Unit: for the purposes of this rule, a natural gas-fired, fan-type 

central furnace designed for installation outside of a building, equipped with a 

protective jacket and integral venting, and labeled for outdoor installation. 

4.0 Exemptions 

[Reserved] The provisions of this rule shall not apply to : 

4.1 Units installed in manufactured homes. 
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4.2 Units using fuels other than natural gas. 

4.3 Nonfan-type residential central furnaces. 

5.0 Requirements 

5.1 No person shall supply, sell, offer for sale, install, or solicit the installation of 

any natural gas-fired, fan-type residential central furnace for use within the 

District unless it has is certified pursuant to Section 6.1 to have NOx emissions 

of oxides of nitrogen less than or equal to 40 nanograms per joule (ng/J) 0.093 

pounds per million BTU (lb/MMBtu) of heat output or 55 ppm NOx at 3.00% 

O2 stack gas by volume(dry). 

5.2 Effective on and after the specified compliance dates in Table 1, no person shall 

supply, sell, offer for sale, install, or solicit the installation of any natural gasfired, fan-type central furnace unless it is certified pursuant to Section 6.1 and 

complies with the applicable NOx emission limit in Table 1. 

Table 1 NOx Emission Limits and Compliance Schedule 

Unit Type NOx Emission Limit 

(nanograms/Joule) Compliance Date 

Units installed in manufactured homes 40 February 1, 2015 

All non-weatherized condensing units except 

those installed in manufactured homes 14 April 1, 2015 

All non-weatherized, non-condensing units 

except those installed in manufactured homes 14 October 1, 2015 

Weatherized units 14 October 1, 2016 

Units installed in manufactured homes 14 October 1, 2018 

5.3 Sell-Through Period 

 Any natural gas-fired, fan-type central furnace manufactured prior to the 

applicable compliance date in Table 1 may be supplied, sold, offered for sale, or 

installed until the applicable sell-through period end-date in Table 2, provided 

the unit is compliant with the following requirements: 

5.3.1 The NOx emission limits and certification requirements in effect on the 

date of manufacture of the unit, and 

 5.3.2 The labeling requirements specified in Section 6.1.2. 
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Table 2 Sell-through Period End-Dates for Units Manufactured Prior to the Applicable 

Compliance Dates in Table 1 

Unit Type Sell-through Period End-date 

All non-weatherized condensing units except 

those installed in manufactured homes January 26, 2016 

All non-weatherized, non-condensing units 

except those installed in manufactured homes July 27, 2016 

Weatherized units July 27, 2017 

Units installed in manufactured homes (for 

certified 40 ng/J units) July 27, 2019 

5.4 Emissions Fee Option 

 Any manufacturer of units regulated by this rule may elect to pay a per unit 

emissions fee of $290 for each condensing furnace and $225 for each noncondensing or manufactured home furnace distributed or sold into the San 

Joaquin Valley in lieu of meeting the 14 ng/J emission limit in Table 1 of this 

rule, provided the NOx emission rate is less than or equal to 40 ng/J. A 

manufacturer may elect to pay the per unit emissions fee for a time period of no 

more than 36 months after the applicable compliance date in Table 1. A 

manufacturer shall submit a compliance plan for each 12-month time period 

after the applicable compliance date during which the manufacturer elects to pay 

the emissions fee in lieu of meeting the NOx emission limit. 

5.4.1 Any manufacturer electing to comply using this emissions fee option 

shall submit to the APCO a compliance plan no later than 30 days prior 

to the applicable compliance date in Table 1. The compliance plan shall 

include the following: 

5.4.1.1 A letter with the name of the manufacturer requesting the 

emissions fee option signed by a responsible official identifying 

the unit type and the 12-month emissions fee option compliance 

period that the emissions fees cover. 

5.4.1.2 An estimate of the quantity of applicable units to be distributed 

or sold into the San Joaquin Valley Air Basin during the 

emissions fee option compliance period and supporting 

documentation. The estimate shall be based on total 

distribution and sales records or invoices of condensing, noncondensing, weatherized or mobile home fan-type central 

furnaces that were distributed or sold into the San Joaquin 

Valley Air Basin during the 12-month period of July 1 to June 

30 prior to the applicable compliance date, along with 

supporting documentation. 
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5.4.2 The manufacturer shall submit a report to the APCO, signed by the 

responsible official for the manufacturer, identifying by model number 

the quantity of applicable units actually distributed or sold into the San 

Joaquin Valley Air Basin during the applicable 12-month emissions fee 

option compliance period and a check for payment of emissions fees for 

those units. The report and payment of emissions fees must be submitted 

to the APCO no later than thirty (30) days after the end of each 12-

month emissions fee option compliance period. 

6.0 Administrative Requirements 

6.1 Emission Certification 

6.1.1 Certified emissions levels shall be demonstrated by an emission 

certification approved under any of the following: 

6.1.1.1 Certification testing as described in Section 6.2 of this rule, 

6.1.1.2 The South Coast Air Quality Management District Certification 

List for Rule 1111 (NOx Emissions From Natural-gas-fired, Fantype Central Furnaces), or 

6.1.1.3 Other emission certification programs approved by the APCO and 

the United States Environmental Protection Agency. 

6.1.2 The manufacturer of the natural gas-fired, fan-type central furnace shall 

comply with the following labeling requirements: 

6.1.2.1 The central furnace manufacturer shall d Display the model 

number of the unit appliance complying with Section 5.0 on the 

shipping container carton and the rating plate of the unit 

appliance.; and 

6.1.2.2 Units manufactured after the applicable compliance date in 

Table 1 shall display the following on the shipping container 

and the rating plate of the unit, in addition to the labeling 

requirements under Section 6.1.2.1: 

6.1.2.2.1 Rated heat input capacity or rated cooling capacity, 

6.1.2.2.2 The applicable NOx emission limit in Section 5.0, 

and 
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6.1.2.2.3 The date of manufacture or date code of the unit. 

6.1.3 Upon request of the APCO, each manufacturer shall submit to the 

District a statement confirming the appliance unit subject to this rule is in 

compliance with the emission limit specified in Section 5.0. The 

statement shall be signed, dated, and shall attest to the accuracy of all 

information. The statement shall include: 

6.1.3.12 Name and address of manufacturer, 

6.1.3.23 Brand name, 

6.1.3.34 Model number, as it appears on the rating plate of the unit, 

6.1.3.45 Rated heat input ratingcapacity, British thermal units per hour, 

and 

 

6.1.3.56 A source test report verifying compliance with Section 5.0. 

6.2 Certification Testing 

6.2.1 During testing, each tested natural gas-fired, fan-type central furnace 

model shall be operated in accordance with the procedures specified in 

10 CFR 430, Subpart B, Appendix N. 

6.2.2 Compliance with the oxides of nitrogen NOx emission requirements in 

Section 5.0 shall be determined using California Air Resources Board 

Method 100, SCAQMD Method 100.1, or United States Environmental 

Protection Agency Methods 7E and 3A. 

6.3 Recordkeeping 

Compliance testing records shall be maintained for five years and made 

available to the APCO upon request. 

7.0 Compliance Schedule 

On and after January 1, 2007, no person shall supply, sell, offer for sale, install, or 

solicit the installation of a unit subject to this rule unless it meets the requirements of 

section 5.0.