DOCKETED  
Docket Number:  20-AAER -02 
Project Title:  Air Filters  
TN #:  247065  
Document Title:  Express Terms for Air Filters  
Description:  Regulatory language proposal for Air Filter available for 
comments under 2nd 15 -day comment period  
Filer:  Alex Galdamez  
Organization:  California Energy Commission  
Submitter Role:  Commission Staff   
Submission Date:  10/28/2022 8:29:17 AM  
Docketed Date:  10/28/2022  
  
 1 Proposed Regulatory Language  
California Code of Regulations 
Title 20. Public Utilities and Energy 
Division 2. State E nergy Resources Conservation and Development 
Commission 
Chapter 4. Energy Conservation 
Article 4. Appliance Efficiency Regulations 
Sections 1601- 1609  
As related to air filters  
 
Amendments to the existing code that were made public with the Notice of 
Proposed Action published on March 15, 2022, are shown in strikethrough 
(example ) to indicate deletions and underlined (example ) to indication additions. 
Additional amendments being proposed and made public with the Public Notice published on August 29, 2022,  are shown in double strike through  (example ) to 
indicate deletions and double underline (example ) for additions. Additional 
amendments being proposed for a second 15 -day public comment period are 
shown in bold -italics strikethrough ( example ) to indicate deletions and bold-
italics wavy-underline ( example ) to indicate additions.  
Section  1601.  Scope  
This Article applies to the following types of new appliances, if sold or offered for sale in California, except those sold wholesale in California for final retail sale outside the state and those designed and sold exclusively for use in recreational vehicles, or other mobile equipment. Unless otherwise specified, each provision 
applies only to units manufactured on or after the effective date of the provision.  
NOTE: For the applicability of these regulations to appliances installed in new 
building construction, see  sections 110.0 and 110.1 of Part 6 of Title 24 of the 
California Code of Regulations.  
…[skipping (a) and (b) ] 
(c) Central air conditioners, which are electrically powered unitary air conditioners and electrically powered unitary heat pumps, except those designed to operate without a fan; and gas -fired air conditioners and gas -fired heat 
pumps, air filters for resi dential buildings for use in forced- air heating or forced-
air cooling equipment , and heat pump water- heating packages.  
…[skipping “(d) Portable air conditioners, evaporative coolers …”, through  end of 
section]   
 2 Note Authority cited: Section s 25213, 25218(e),  25402(a) -25402(c), and 25960, 
Public Resources Code; and sections 16, 26, and 30, Governor’s Exec. Order No. 
B-29-15 (April 1, 2015).  
Reference: Section s 25216.5(d), 25402(a) -25402(c), 25402.5.4, and 25960, 
Public Resources Code; and section 16, Governor’ s Exec. Order No. B -29-15 
(April 1, 2015).  
Section  1602. Definitions  
…[skipping (a) and (b)]  
(c) Air Conditioners, Air Filters, and Heat Pump Water -Heating Packages.  
…[skipping “Air Conditioner” and “Air -cooled air conditioner”]  
“Air filter” means ana disposable or reusable  air-cleaning device  with air filtering 
media encased in a frame of a nominal depth of no greater than 6.0 inches 
installed in forced air heating or cooling equipment and  used for removing 
particulate matter  from the air  and designed for installation in residential ducted 
forced -air ventilation , heating , or cooling  systems.  
(1) Air filter do es not include:  
(A) Electronic air cleaner s; 
(B) Filter media sold as rolls , i.e. not encased in a frame ; 
(C) Air filters designed and sold exclusively for installation in products 
other than  residential ducted forced -air systems. 
…[skipping “Air filter depth” to “Air -source heat pump”]  
“Basic model” of an air filter means all units of a given type of air filter , 
irrespective of the face area  dimensions , that have  the same depth and the same 
construction, including type and grade  of air filter media, pleat spacing, pleat 
height, pleat support, and filter frame pattern.  
…[skipping “Basic model” of a federally regulated central air… to “ Dust holding 
capacity Maximum rated airflow rate ”] 
“Electronic air cleaner” means electrically powere d filtration  equipment that uses 
high voltage electrostatic principles to collect particulate matter. It may be of 
single -stage or multi -stage configuration. Part or all of  the charging and/or 
collecting sections may be manually cleanable, automatically cleanable, or 
disposable.   
“Minimum efficiency reporting value (MERV)” of an air filter means the composite particle efficiency metric defined in ANSI/ ASHRAE Standard 52.2-20122017.  
 3 …[skipping “Multi -head mini -split system” to “Particle size”]  
“Particle size efficiency” of an air filter , also known as “particle size removal 
efficiency” , means the fraction (percentage) of particles that are captured on the 
air filter. Particl e size efficiency is measured in three particle size ranges: 0.3 -1.0, 
1.0-3.0, 3.0- 10 micrometers ( μm). Particle size efficiency  is abbreviated as “PSE” 
in the required labels  marking for air filters.  
…[skipping “Premium motor” ]  
 “Pressure drop” of an air filter means the drop in static pressure versus air flow 
rate across air filter media in the forced- air ventilation, heating or cooling 
equipment  system . 
…[skipping “Room air conditioner” through  (x)”Landscape Irrigation Equipment ”] 
The following documents are incorporated by reference in Section 1602.  
…[skipping FEDERAL STATUTES AND REGULATIONS to ADOB E SYSTEMS 
INCORPORATED]  
Number                                                      Title 
AMERICAN NATIONAL STANDARDS INSTITUTE (AN SI) 
ANSI/ASHRAE Standard 52.2 -2017 
Method of Testing General Ventilation Air -Cleaning Devices for Removal 
Efficiency by Particle Size  
 
…[skipping ANSI C78.1 -1991 (R1996) to end of section]  
Note: Sections 25213, 25128(e), 25402(a) -25402(c) and 25960, Public 
Resources Code; and sections 16, 26 and 30, Governor’s Exc. Order No. B -29-15 
(April 1, 2015). Reference: Sections 25216.5(d), 25402(a) -25402(c), 25402.5.4 
and 25960, Public Resources Code; and section 16, Governor’s Exec. Order No. 
B-29-15 (April 1, 2015).  
Section  1604. Test Methods for Specific Appliances  
…[skipping (a) and (b)]  
(c) Central Air Conditioners, Air Filters, and Heat Pump Water -Heating Packages.  
...[skipping (1) and (2)]  
 (3) Air Filters.  
(A) The test methods for air filters are shown in Table C -2. Manufacturers 
shall test each basic model of air filter at dimensions determined by 
the manufacturer .  
 4 Table C -2: Air Filter Test Methods  
Appliance  Performance 
Criteria  Test Method  
Air Filter Pressure Drop AHRI 680-2009* AHRI Standard 
680 (I -P)-2017* or ANSI/ASHRAE 
Standard 52.2 -2012 ANSI/ASHRAE 
Standard 52.2 -2017 
Minimum Efficiency Reporting 
Value (MERV) ANSI/ASHRAE Standard 52.2 -
2012ANSI/ASHRAE Standard 52.2 -
2017 
Air Filter Particle Size Efficiency  AHRI 6 80-2009* AHRI Standard 
680 (I -P)-2017* or ANSI/ASHRAE 
Standard 52.2 -2017 ANSI/ASHRAE 
Standard 52.2 -2012 
Dust Holding Capacity  AHRI 680-2009*AHRI Standard 
680 (I -P)-2017* or ANSI/ASHRAE 
Standard 52.2 -2017 ANSI/ASHRAE 
Standard 52.2-2012 
* MERV not reportable for models 
being tested to AHRI Standard 680 
(I-P)-2017 AHRI 680- 2009 only  
 
(B) The following procedure shall be used to calculate the airflow rate value in 
cubic feet per minute at an initial resistance pressure difference of 0.1 i nches 
water column:  
1. The value or airflow rate at an initial resistance of 0.1 inches water 
column shall be determined from a least -squares fit to airflow rate in cfm, 
as a function of initial resistance static pressure difference in inches water 
column, using:  
𝑄𝑄=𝐶𝐶×𝑑𝑑𝑑𝑑𝑛𝑛, where Q=airflow rate in cfm, dP=initial resistance pressure 
difference in inches water column, and C and n are the coefficients 
determined in the least squares fit.  
2. The data used for this fit shall be the following ordered pairs: (0,0), 
(initial resistance value 1, airflow rate value 1), (initial resistance value 2, 
airflow rate value 2), (initial resistance value 3, airflow rate value 3), 
(initial resistance value 4, airflow rate value 4), (initial resistance value 5,  
 5 airflow rate value 5 (only applicable when using the ANSI/ASHRAE 
Standard 52.2 -2017 test procedure))  
3. The value for airflow rate at an initial resistance of 0.1 -inch water 
column shall be calculated as: 𝑄𝑄=𝐶𝐶× 0.1𝑛𝑛 
 
Manufacturers shall test  small, medium, and large size filters for each 
grade. 
…[skipping (c)(4) through  (x)] 
The following documents are incorporated by reference in section  1604.  
Number                                                      Title 
…[skipping FEDERAL TEST METHODS and UNITED STATES ENVIRONMENTAL 
PROTECTION AGENCY (EPA)]  
AIR-CONDITIONING, HEATING, AND REFRIGERATION INSTITUTE (AHRI)  
AHRI 680-20092009 Standard 680 (I -P)-2017 
20092017 Standard for Performance Rating of Residential Air Filter Equipment  
…[skipping the rest of AIR-CONDITIONING, HEATING, AND REFRIGERATION 
INSTITUTE (AHRI) ] 
AMERICAN NATIONAL STANDARDS INSTITUTE (ANSI)  
ANSI/ASHRAE Standard 52.2 -2017 
Method of Testing General Ventilation Air -Cleaning Devices for Removal 
Efficiency by Particle Size  
...[skipping the rest of AMERICAN NATIONAL STANDARDS INSTITUTE (ANSI) 
through AMERICAN SOCIETY FOR TESTING AND MATERIALS (ASTM)]  
AMERICAN SOCIETY OF HEATING, REFRIGERATING AND AIR -CONDITIONING 
ENGINEERS (ASHRAE)  
ASHRAE 52.2 -2012 Method of Testing General Ventilation Air -
Cleaning Devices for Removal Efficiency by 
Particle Size 
…[skipping ANSI/ASHRAE 118.2- 1993 to end of section]  
Note: Authority cited: Sections 25213, 25218(e), 25402(a) -25402(c), and 25960, 
Public Resources Code; and section s 16, 26 and 30, Governor’s Exec. Order No. 
B-29-15 (April 1, 2015 ). Reference: Sections 25216.5(d), 25402(a) -25402(c), and  
 6 25960, Public Resources Code; and section 16, Gover nor’s Exec. Order No. B -29-
15 (April 1, 2015).  
Section  1606. Filing by Manufacturers; Listing of Appliances 
in Database  
(a) Filing of Statements. 
Each manufacturer shall electronically file with the Executive Director through 
the MAEDbS a statement for each appliance that is sold or offered for sale in California. The statement shall contain all the information described in paragraphs (2) through (4 ) of this subsection and shall meet all of the 
requirements of paragraph (1) of this subsection and all other applicable 
requirements in this Article.  
The effective dates of this section shall be the same as the effective dates 
shown in section 1605.1, 1605.2 or 1605.3 of this Article for appliances for which there is an energy efficiency, energy consumption, energy design, water efficiency, water consumption, or water design standard in section 1605.1, 1605.2, or 1605.3 of this Article. For appliances with  no energy 
efficiency, energy consumption, energy design, water efficiency, water consumption, or water design standard in section 1605.1, 1605.2, or 1605.3 of this Article, the effective date of this section shall be one year after they are added to secti on 1601 of this Article, unless a different effective date is 
specified.  
EXCEPTIONS to Section 1606(a) of this Article: Section 1606(a) of this 
Article is not applicable to:  
1. external power supplies , 
2. small electric motors , 
3. á la carte chargers meeting the EXCEPTON noted in section 
1605.3(w)(2) of this Article, or  
4. general service lamps 
(1) General Rules.  
…[skipping (A) to (H)]  
 (I) Air Filters. The statement for air filters shall be for each basic 
model of air filter tested under  section 1604(c)( 3) of this Article . 
...[skipping (a)(2) through (a)(3)(D)]  
   
 7  
Table X: Data Submittal Requirements  
…[skipping “All Appliances ” to B “Packaged Terminal Air Conditioners and 
Packaged Terminal Heat Pumps ”] 
C Air Filters 
manufactured on or after April 1, 2019 
December  1, 
2022 April  
July 1, 
20242023   Air filter sizes tested  Small, medium, 
and large  
Minimum Efficiency Reporting Value 
(MERV)  (reportable for models tested to 
ASHRAE 52.2- 2012 only)  1, 2, 3, 4, 5, 6, 7, 
8, 9, 10, 11, 12, 
13, 14, 15, 16, 17, 
18, 19, 20, N/A 
Particle Size Efficiency for 0.3 to 1.0 μm 
particle size   
Particle Size Efficiency for 1.0 to 3.0 μm 
particle size   
Particle Size Efficiency for 3.0 to 10.0 
μm particle size   
Test Procedure used to determine air 
filter efficiency performance AHRI 680 -2009, or 
ASHRAE 52.2- 2012 
Air Filter Length   
Air Filter Width   
Air Filter Depth   
Air Filter Face Area   
Face Velocity Utilized for the test 
procedure  Value in feet per 
minute  or N/A  
Airflow Rate value 1   
Airflow Rate value 2   
Airflow Rate value 3   
Airflow Rate value 4   
Airflow Rate value 5 -Maximum Rated 
Airflow Rate   
Initial Resistance at air flow rate value 1  Test results to one-
hundredths of an  
 8 Inch of Water 
Column  
Initial Resistance at airflow rate value 2  Test results to one-
hundredths of an 
Inch of Water 
Column  
Initial Resistance at airflow rate value 3  Test results to one -
hundredths of an 
Inch of Water 
Column  
Initial Resistance at airflow rate value 4  Test results to one -
hundredths of an 
Inch of Water 
Column  
Initial Resistance at airflow rate value 5  Test results to one -
hundredths of an 
Inch of Water 
Column  
Final Resistance at the point where test 
is terminated and results determined  Test results to on e-
hundredths of an 
Inch of Water 
Column  
Dust Holding Capacity at the maximum 
rated airflow rate as published by the 
manufacturer  Test results in 
multiples of one 
gram.  
Airflow Rate value determined at an 
Initial Resistance of 0.1 Inch of Water 
Column   
  Length of tested air filter (inches)   
  Width of tested air filter (inches)   
  Depth of tested air filter (inches)   
  Face Area of tested air filter (square 
inches)   
  Test Procedure used  AHRI Standard 680 
(I-P)-2017, 
ANSI/ASHRAE  
 9 Standard 52.2 -
2017 
  Face Velocity Utilized for the test 
procedure  
(feet per minute)   
  Minimum Efficiency Reporting Value 
(MERV)  
(if ANSI/ASHRAE Standard 52.2 -2017 
was used )  
  Particulate Matter (PM) Efficiency  
for PM 1.0  Particle Size Efficiency for 
0.3 to 1.0 μm particle size (percentage)   
  Particle Size Efficiency for 1.0 to 3.0 μm 
particle size (percentage)   
  Particle Size Efficiency for 3.0 to 10.0 
μm particle size (percentage)   
  Airflow Rate value 1 (cubic feet per 
minute)   
  Airflow Rate value 2 (cubic feet per 
minute)   
  Airflow Rate value 3 (cubic feet per 
minute)   
  Airflow Rate value 4 (cubic feet per 
minute)   
  Airflow Rate value 5 (cubic feet per 
minute)  
(Maximum Airflow Rate if ANSI/ASHRAE 
Standard 52.2 -2017 was used )  
  Calculated Airflow Rate value at an 
Initial Resistance of 0.1 inches water 
column (cubic feet per minute)7  
  Initial Resistance at air flow rate value 1 
(inches water column)   
  Initial Resistance at airflow rate value 2 
(inches water column)    
 10   Initial Resistance at airflow rate value 3 
(inches water column)   
  Initial Resistance at airflow rate value 4 
(inches water column)   
  Initial Resistance at airflow rate value 5 
(inches water column)  
(if ANSI/ASHRAE Standard 52.2 -2017 
was used )  
  Final Resistance at the point where test 
is terminated and results determined 
(inches water column)   
  Dust Holding Capacity at the 
maximum rated airflow rate as 
published by the manufacturer 
(grams)   
 …[skipping C All Central Air Conditioners … through end of Table X...] 
The following documents are incorporated by reference in section  1606. 
…[skipping CALIFORNIA ENERGY COMMISSION through FEDERAL STATUTES 
AND REGULATIONS]  
Number                                                      Title 
AIR-CONDITIONING, HEATING, AND REFRIGERATION INSTITUTE (AHRI)  
AHRI Standard 680 (I -P)-2017 2017 Standard for Performance Rating of 
Residential Air Filter Equipment  
AMERICAN NATIONAL STANDARDS INSTITUTE (ANSI)  
ANSI/ASHRAE Standard 52.2 -
2017 Method of Testing General Ventilation Air -
Cleaning Devices for Removal Efficiency by 
Particle Size 
…[skipping  NATIONAL ELECRTICAL MANUFACTURER’S ASSOCIATION (NEMA)  
through the  end of section]  
Note: Authority cited: Sections 25213, 25218(e), 25402(a) -25402(c) and 25960, 
Public Resources Code; and sections 16, 26 and 30, Governor’s Exec. Order No. 
B-29-15 (April 1, 2015). Reference: Sections 25216.5(d), 25402(a) -25402(c),  
 11 25402.5.4 and 25960, Public Resources Code: and section 16, Governor’s Exec. 
Order No. B -29-15 (April 1, 2015).  
Section  1607. Marking of Appliances  
…[skipping (a) t hrough  (c)] 
 (d) Energy Performan ce Information  
...[skipping (1) through  (10)] 
(11) Air Filters. Each unit of air filters manufactured on or after April 1, 
2019 shall be marked, permanently and legibly, on an accessible and 
conspicuous place on the edge of the filter itself or on the pleats, in 
characters of font size 12, with the information specified in either 
section (A) or (B) below as applicable to the air filter model:  
(A) Air filters for which the reported information is determined in 
accordance with the AHRI standard 680- 2009 shall be marked with 
the following information:  
1. Particle size efficiency (PSE) of the unit in three particle size 
ranges: 0.3 -1.0, 1.0 -3.0, 3.0- 10 micrometers (μm).  
2. Initial resistance for the range of airflow rates as published by 
the manufacturer, including the maximum rated airflow rate. 
The selected airflow rates shall be in multiples of 400 cfm. If the 
maximum rated airflow rate is not a multiple of 400 cfm, then 
report initial resistance at multiples of 400 cfm, and any fraction 
thereof, to include the maximum rated airflow rate as described 
in subsections a, b, c, d, e below.  
a. Airflow Rate Value 1 (val 1) = 400 cubic -feet-per-minute 
(cfm). If 400 cfm is not within the manufacturer's published 
range of airflow rates for the filter, value = N/A.  
b. Airflow Rate Value 2 (val  2) = 800 cubic- feet-per-minute 
(cfm). If 800 cfm is not within the manufacturer's published 
range of airflow rates for the filter, value = N/A.  
c. Airflow Rate Value 3 (val 3) = 1200 cubic -feet-per-minute 
(cfm). If 1200 cfm is not within the manufacturer's published 
range of airflow rates for the filter, value = N/A.  
d. Airflow Rate Value 4 (val 4) = 1600 cubic -feet-per-minute 
(cfm). If 1600 cfm is not within the manufacturer's published 
range of airflow rates for the filter, value = N/A  
e. Airflow Rate Value 5 (val 5) = Maximum Rated Airflow Rate 
(cfm).  
3. Mark the non -reported MERV information field as “N/A.”   
 12 (B) Air filters for which reported information is determined in 
accordance with ASHRAE Standard 52.2 -2012 shall be marked with 
the following informa tion: 
1. Particle size efficiency (PSE) of the unit in three particle size 
ranges: 0.3 -1.0, 1.0 -3.0, 3.0- 10 micrometers (μm).  
2. Initial resistance for the range of airflow rates as published by 
the manufacturer, including the maximum rated airflow rate. 
The airflow rate values shall be the maximum rated airflow rate, 
and the values for 50%, 75%, 100% and 125% of the test 
airflow rate value determined in accordance with ASHRAE 52.2 -
2012. as described in subsections a, b, c, d, e below.  
a. Airflow Rate Value  1 (val 1) = 50% of the test airflow rate in 
cubic-feet-per-minute (50% of airflow rate value 3).  
b. Airflow Rate Value 2 (val 2) = 75% of the test airflow rate in 
cubic-feet-per-minute (75% of airflow rate value 3).  
c. Airflow Rate Value 3 (val 3) = 100% test airflow rate in 
cubic-feet-per-minute; determined as equal to selected test 
face velocity (feet per minute) multiplied by the air filter face 
area (square feet).  
d. Airflow Rate Value 4 (val 4) = 125% of the test airflow rate 
in cubic -feet-per-minute (125% of airflow rate value 3.  
e. Airflow Rate Value 5 (val 5) = Maximum Rated Airflow Rate 
(cfm).  
3. Minimum Efficiency Reporting Value (MERV).  
The information shall be disclosed in the format in Table Z.  
 
Table Z  
Sample Air Filter Marking  
MERV (µm) 
PSE 
(%) 0.30-1.0 1.0-3.0  3.0-10  Airflow 
Rate (CFM) [val 1] [val 2] [val 3] [val 4] [val 5] *Max Rated 
Airflow 
[value] [value] [value] [value] Initial 
Resistance 
(IWC) [value] [value] [value] [value] [value] 
 
If the marking on the air filter is not legible through its retail 
packaging, then the packaging shall also be labeled with the 
same information and in the same format as Table Z. The  
 13 requirements of this section shall not preclude manufacturers 
from providing additional information.  
  
(11) Air Filters. Each unit of air filters manufactured on or after December  1, 
2022 April 1, 2023  July 1, 2024 , shall be marked, permanently and legibly, 
on an accessible and conspicuous place on the edge of the filter itself or 
on the pleats  edge of the filter itself or on the pleats , filter  retail  package  
in characters of font size 12 or larger , with the information specified in either 
section (A) or (B) below as applicable to the air filter unit. In addition,  each 
unit of air filters manufactured on or after January 1, 2026 , shall be 
marked, permanently and legibly, on an accessible and conspicuous 
place on the edge of the filter frame  in font size 12 or larger 
characters , with the calculated airflow rate value at an Initial 
Resistance of 0.1 inches water column (cubic feet per minute) , and 
with either the filter’s particle size efficiency in the 0.3 to 1.0 
micrometer range  or the filter’s MERV rating . If the marking on the air 
filter is not legible through its retail packaging, then the packaging shall also 
be marked with the same information and in the same format. Sample air 
filter markings  package lab els and air filter  frame markings are shown in 
Tables Z -1 and, and Z-2, and Z -3. 
(A) Air filters for which the basic model has been tested in accordance 
with AHRI Standard 680 (I -P)-2017.  
1.  Air filters that have been tested and for which the reported 
information is determined in accordance with the AHRI  Standard 
680 (I -P)-2017 shall be marked with the following information:  
a. Particle size efficiency (PSE) of the unit in three particle size 
ranges: 0.3 -1.0, 1.0 -3.0, 3.0- 10 micrometers ( μm). 
 b. Initial resistance for the range of airflow rates as published by 
the manufacturer, including the maximum rated airflow rate. 
The airflow rate values shall be the values for 25%, 50%, 
75%, and 100% of the maximum rated airflow rate determined 
in accorda nce with AHRI Standard 680 (I -P)-2017 as described 
in subsections (i), (ii), (iii), (iv) below. 
(i) Airflow Rate Value 1 (val 1) = 25% of the maximum rated 
airflow rate in cfm (25% of airflow rate  of value 4) . 
(ii) Airflow Rate Value 2 (val 2) = 50% of the maximum rated 
airflow rate in  cfm (50% of airflow rate of value 4 ).  
 14 (iii) Airflow Rate Value 3 (val 3) = 75% of the maximum rated 
airflow rate in  cfm (75% of airflow rate of value 4). 
(iv) Airflow Rate Value 4 (val 4) = 100% of the maximum rated 
airflow ra te in cfm.  
2. Air filter  sizes that ha ve not been tested shall be marked with 
information that is based on the information for an air filter of the 
same basic model which has been tested per section 1604(c)( 3) of 
this Article  in accordance with the AHRI Standard 680 (I -P)-2017 
and certified to the Energy Commission per section 1606(a)(1)(I) 
of this Article . Information for an air filter that has not been tested 
shall be determined at a face velocity that is identical to the fa ce 
velocity used for the test procedure for the tested air filter of the 
same basic model. Air filters that have not been tested shall be 
marked with the following information:  
a.  Particle size efficiency (PSE) of the unit in three particle size 
ranges: 0 .3-1.0, 1.0 -3.0, 3.0- 10 micrometers ( μm). The PSE 
values for an air filter that has not been tested s hall be identical 
to the PSE values determined for a tested air filter of the same 
basic model.  
b. Initial resistance values for the range of airflow rate values 1 
through 4. The initial resistance values for an air filter that has 
not been tested shall be identical to the initial resistance values 1 
through 4 determined for a tested air filter of the same basic 
model.  
c. Airflow rate values 1 through 4 for an air filter that has not been 
tested shall each be equal to the corresponding airflow rate 
values 1 through 4 from a tested air filter of the same bas ic 
model multiplied by the face area of the filter that has not been 
tested and divided by the face area  of the tested air filter of the 
same basic model.  
(B) Air filters for which the basic model has been tested in accordance 
with A NSI/ASHRAE Standard 52. 2 2017.  
1.   Air filters that have been tested and for which the reported 
information is determined in accordance with ANSI/ASHRAE  
Standard 52.2 -2017 shall be marked with the following 
information:  
a. Particle size efficiency (PSE) of the unit in three particle size 
ranges: 0.3 -1.0, 1.0 -3.0, 3.0- 10 micrometers ( μm).  
 15 b. Initial resistance for the range of airflow rates as published by 
the manufacturer, including the maximum rated airflow rate. 
The airflow rate values shall be the maximum rated airflow rate, 
and the values for 50%, 75%, 100% and 125% of the test 
airflow rate value determined in a ccordance with ANSI/ASHRAE 
52.2-2017 as described in subsections  (i), (ii), (iii), (iv), (v) 
below.  
(i) Airflow Rate Value 1 (val 1) = 50% of the test airflow rate in 
cfm (50% of airflow rate value 3).  
(ii) Airflow Rate Value 2 (val 2) = 75% of the test ai rflow rate in 
cfm (75% of airflow rate value 3).  
(iii) Airflow Rate Value 3 (val 3) = 100% of the test airflow rate 
in cfm; determined as equal to selected test face velocity 
(feet per minute) multiplied by the air filter face area (square 
feet).  
(iv) Airflow Rate Value 4 (val 4) = 125% of the test airflow rate 
in cfm (125% of airflow rate value 3).  
(v) Airflow Rate Value 5 (val 5) = Maximum Rated Airflow Rate 
in cfm  as published by the manufacturer. 
c. Minimum Efficiency Reporting Value (MERV). The value s hall be 
a whole number between 1 and 16. 
2. Air filter  sizes that have not been tested shall be marked with 
information that is based on the information for an air filter of the 
same basic model which has been tested per section 1604(c)( 3) of 
this Article  in accordance with the ANSI/ASHRAE Standard 52.2 -
2017 and certified to the Energy Commission per section 
1606(a)(1)( I) of this Article. Information for an air filter that has 
not been tested shall be determined at a face velocity that is 
identical to the face velocity used for the test procedure for the 
tested air filter of the same basic model. Air filters that have not 
been tested shall be marked with the following information:  
a. Particle size efficiency (PSE) of the unit in three particle size 
ranges: 0.3 -1.0, 1.0 -3.0, 3.0- 10 micrometers ( μm). The PSE 
values for an air filter that has not been tested shall be identical 
to the PSE values determined for a tested air filter of the same 
basic model.  
b.  Initial resistance values for the range of air flow rate values 1 
through 5. The initial resistance values for an air filter that has  
 16 not been tested shall be identical to the initial resistance values 
1 through 5 determined for a tested air filter of the same basic 
model.  
c.  Airflow rate values 1 through 5. Airflow rate values 1 through 5 
for an air filter that has not been tested shall each be equal to 
the corresponding airflow rate values 1 through 5 from a tested 
air filter of the same basic model multiplied by the face area of 
the filter that has not been tested and divided by the face area 
of the tested air filter of the same basic model.  
d. Minimum Efficiency Reporting Value (MERV). The MERV for an 
air filter that has not been tested shall be identical to the value 
determined for a tested air filter of the same basic model. The 
value shall be a whole number between 1 and 16.  
 
Table Z -1: Sample Air Filter  Marking Package Label Marking  (AHRI Standard 
680 [I -P]-2017)  
(µm) 
PSE 
(%) 0.30-
1.0 1.0-3.0 3.0-10 Airflow 
Rate 
(CFM)  [val 1]  [val 2]  [val 3]  [val 4]* 
*Max 
Rated 
Airflow  
[val] [val] [val] Initial 
Resista
nce 
(IWC)  [val] [val] [val] [val] 
 
Table Z -2: Sample Air Filter  Marking Package Label Marking (ANSI/ASHRAE 
Standard 52.2 -2017)  
MERV  
(µm) 
PSE 
(%) 0.30-
1.0 1.0-3.0 3.0-10 Airflow 
Rate 
(CFM)  [val1]  [val2]  [va3] [val4]  [val5]*  
*Max 
Rated 
Airflow  
[val] [val] [val] [val] Initial 
Resista
nce 
(IWC)  [val] [val] [val] [val] [val] 
  
 17 Table Z -3: Sample Air Filter Frame Marking s 
Sample Airflow Marking  Sample Filration Marking  
Airflow : [val]  0.30 – 1.0 µm PSE: [val]   
or  
MERV: [val]  
 
...[skipping (12) through the  end of  the section] 
Note: Authority cited: Sections 25213, 25218(e), 25402(a) -25402(c) and 25960, 
Public Resources Code. Reference: Sections 25216.5(d), 25402(a) -25402(c) and 
25960, Public Resources Code.