Air filter standards (Chapter 12‑71)

Grounded in the retrieved California Referenced Standards Code — click a citation to read the verbatim passage:

• CRSC § 12-71 High relevance — show source text

  STATE FIRE MARSHAL

  DESCRIPTION OF TEST APPARATUS, METHOD AND CLASSIFICATION REQUIREMENTS FOR AIR FILTERS

  Sec. 12-71-100.

  (a) Test apparatus.

  1. The test duct, made of M.S. gage galvanized sheet metal reinforced with angle irons, is 21 inches square (13 548 mm [2] ) and 13 [1] / 2 feet (4114 mm) long.
  2. One end of the duct is tapered to the discharge of a variable-speed blower and the other end is open to discharge. A metal filter frame is provided near the middle of the length of the duct to receive one 20 by 20 inches (508 mm by 508 mm) (nominal) filter unit. Two tightfitting doors, located to permit access to the filter frame, are each provided with a mica window to permit observation of both faces of the filter and conditions in the duct downstream from the filter.
  3. Two 1-inch (25 mm) pipe elbows, about 18 inches (457 mm) from the base of the test filter, form gas burner outlets adjusted to provide yellow, wavering flames. The burners consume approximately 4 cubic feet (approximately 1,000 Btu/cubic feet) of gas per minute.
  4. With the filter in place the air velocity is adjusted to approximately 200 linear feet per minute as measured at the discharge end of the duct by an Alnor Velometer Anemometer.

  (b) Test method.

  1. Filters are tested clean, that is, unused. The flames are applied for 3 minutes during which time observations are made of both faces of the filter as to the downstream travel of flame or sparks and the density, duration and character of the products of combustion.

  2. Smoke density is measured as the drop in light intensity on a microammeter by means of photoelectric cell mounted a few inches below and about 12 inches (305 mm) inside the discharge end of the duct. The light source, stabilized for light intensity, is mounted 1 inch (25 mm) above the duct directly above the photoelectric cell. The microammeter readings are recorded every 5 seconds for the first minute and every 10 seconds for the next 2 minutes.

  3. The differences between these readings and the readings taken before the test are plotted against time (the scale being 40 μA and 40 seconds to the inch) with the resulting area under the curve being measured by use of a planimeter or calculated mathematically. This area is a measure of the smoke density produced during the test.

  (c) Classification. As a result of the tests, air filter units are classified as Class 1 or 2 as indicated below:

  1. Class 1 air filter units are those which, when clean, do not produce flames or sparks when attacked by flame and which develop areas under the smoke density curves that are less than 1.5 square inches (967 mm [2] ).
  2. Class 2 air filter units are those which, when clean, burn moderately when attacked by flame or emit moderate amounts of smoke or both. These units, although they may be consumed to some extent, do not project flames or extensive sparks that would ignite adjacent combustible materials beyond the discharge end of the duct during the test and do not develop areas under the smoke density curves that are more than 6.0 square inches (3871 mm [2] ).

  (d) Adhesive coatings. Liquid-adhesive coatings used on filters shall have a flash point of 325°F (163°C) Cleveland open cup tester, or higher.

• CRSC § 436.5. High relevance — show source text

  DEPARTMENT OF HEALTH SERVICES

  Authority: Sections 102, 208 and 25811.

  Reference: Sections 102, 208 and 436.5.

  ALL HEALING ARTS X-RAY INSTALLATIONS

  Sec. 12-31C-101. All radiation shielding barriers in rooms and enclosures housing radiation machines shall comply with the mandatory standards and appendices in Report No. 35, “Dental X-RAY Protection”; Report 49, “Structural Shielding Design and Evaluation for Medical use of X-rays and Gamma Rays of Energies up to 10 MeV”; and Report No. 51, “Radiation Protection Design Guidelines for 0.1-100 MeV Particle Accelerator Facilities.” Published by the National Council on Radiation Protection and Measurements, 7910 Woodmont Avenue, Bethesda, Maryland 20814.

  2025 CALIFORNIA REFERENCED STANDARDS CODE 105

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  106 2025 CALIFORNIA REFERENCED STANDARDS CODE

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  12-71 AIR FILTERS

  STANDARD 12-71-1

  STATE FIRE MARSHAL

  DESCRIPTION OF TEST APPARATUS, METHOD AND CLASSIFICATION REQUIREMENTS FOR AIR FILTERS

  Sec. 12-71-100.

  (a) Test apparatus.

  1. The test duct, made of M.S. gage galvanized sheet metal reinforced with angle irons, is 21 inches square (13 548 mm [2] ) and 13 [1] / 2 feet (4114 mm) long.
  2. One end of the duct is tapered to the discharge of a variable-speed blower and the other end is open to discharge. A metal filter frame is provided near the middle of the length of the duct to receive one 20 by 20 inches (508 mm by 508 mm) (nominal) filter unit. Two tightfitting doors, located to permit access to the filter frame, are each provided with a mica window to permit observation of both faces of the filter and conditions in the duct downstream from the filter.
  3. Two 1-inch (25 mm) pipe elbows, about 18 inches (457 mm) from the base of the test filter, form gas burner outlets adjusted to provide yellow, wavering flames. The burners consume approximately 4 cubic feet (approximately 1,000 Btu/cubic feet) of gas per minute.
  4. With the filter in place the air velocity is adjusted to approximately 200 linear feet per minute as measured at the discharge end of the duct by an Alnor Velometer Anemometer.

  (b) Test method.

  1. Filters are tested clean, that is, unused. The flames are applied for 3 minutes during which time observations are made of both faces of the filter as to the downstream travel of flame or sparks and the density, duration and character of the products of combustion.
• CRSC § 52.2 High relevance — show source text

  Q filter = design airflow rate for the air filter, ft [3] /min V face = air filter face velocity ≤ 150 ft/min iii. All system air filters shall be located and installed in such a manner as to be accessible for regular service by the system owner. iv. All system air filter installation locations shall be labeled to disclose the applicable design airflow rate and the maximum allowable clean-filter pressure drop. The labels shall be permanently affixed to the air filter installation location, readily legible and visible to a person replacing the air filter. v. Filter racks or grilles shall use gaskets, sealing or other means to close gaps around inserted filters and prevent air from bypassing the filter. C. Air filter efficiency. The system shall be provided with air filters having a designated efficiency equal to or greater than MERV 13 when tested in accordance with ASHRAE Standard 52.2, or a particle size efficiency rating equal to or greater than 50 percent in the 0.30–1.0 μm range, and equal to or greater than 85 percent in the 1.0–3.0 μm range when tested in accordance with AHRI Standard 680.

  D. Air filter pressure drop. All systems shall be provided with air filters that conform to the applicable maximum allowable clean-filter pressure drop specified in Subsection i, ii, iii or iv below, when tested using ASHRAE Standard 52.2, or as rated using AHRI Standard 680, for the applicable design airflow rates for the system air filters. i. The maximum allowable clean-filter pressure drop shall be determined by the system design for the nominal 2inch minimum depth air filter required by Section 160.2(b)1Biia, or ii. A maximum of 25 Pa (0.1 inches water) clean-filter pressure drop shall be allowed for a nominal 1-inch depth air filter sized according to Section 160.2(b)1Biib, or iii. For systems specified in Sections 160.2(b)1Aii and 160.2(b)1Aiii, the maximum allowable clean filter pressure drop shall be determined by the system design. iv. If Exception 1 to Section 160.3(b)5Lii or iv is utilized for compliance with cooling system airflow rate and fan efficacy requirements, the clean-filter pressure drop for the system air filter shall conform to the requirements given in Table 160.3-A or 160.3-B.

  2025 CALIFORNIA ENERGY CODE 201

  on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.

  MULTIFAMILY BUILDINGS—MANDATORY REQUIREMENTS

  E. Air filter product labeling. Systems described in Section 160.2(b)1Ai shall be equipped with air filters that have been labeled by the manufacturer to disclose the efficiency and pressure drop ratings that demonstrate conformance with Sections 160.2(b)1C and 160.2(b)1D. Exception to Section 160.2(b)1: Evaporative coolers are not required to comply with the air filtration requirements in Section 160.2(b)1. 2. Ventilation and indoor air quality for attached dwelling units . All attached dwelling units shall meet the requirements of ASHRAE Standard 62.2, Ventilation and Acceptable Indoor Air Quality in Residential Buildings subject to the amendments specified in Section 160.2(b)2A below. All dwelling units shall comply with Section 160.2(b)2B below.

• CRSC § 150.0 High relevance — show source text

  (Equation 150.0-A) A face = Q filter / V face

  where

  A face = air filter face area, the product of air filter nominal length x nominal width, ft [2] . Q filter = design airflow rate for the air filter, ft [3] /min. V face = air filter face velocity ≤ 150, ft/min. iii. All system air filters shall be located and installed in such a manner as to be accessible for regular service by the system owner. iv. All system air filter installation locations shall be labeled to disclose the applicable design airflow rate and the maximum allowable clean-filter pressure drop. The labels shall be permanently affixed to the air filter installation location, readily legible, and visible to a person replacing the air filter. v. Filter racks or grilles shall use gaskets, sealing or other means to close gaps around inserted filters to and prevent air from bypassing the filter. C. Air filter efficiency. The system shall be provided with air filter(s) having a designated efficiency equal to or greater than MERV 13 when tested in accordance with ASHRAE Standard 52.2, or a particle size efficiency rating equal to or greater than 50 percent in the 0.30 – 1.0 μm range, and equal to or greater than 85 percent in the 1.0 – 3.0 μm range when tested in accordance with AHRI Standard 680.

  D. Air filter pressure drop. All system shall be provided with air-filter(s) that conforms to the applicable maximum allowable clean-filter pressure drop specified in Subsections i, ii, iii, or iv below, when tested using ASHRAE Standard 52.2, or as rated using AHRI Standard 680, for the applicable design airflow rate(s) for the system air filter(s). i. The maximum allowable clean-filter pressure drop shall be determined by the system design for the nominal two-inch minimum depth air filter required by Section 150.0(m)12Biia, or ii. A maximum of 25 PA (0.1 inches water) clean-filter pressure drop shall be allowed for a nominal one-inch depth air filter sized according to Section 150.0(m)12Biib, or iii. For systems specified in 150.0(m)12Aii, and 150.0(m)12Aiii, the maximum allowable clean filter pressure drop shall be determined by the system design. iv. If Exception 1 to Section 150.0(m)13B or D is utilized for compliance with cooling system airflow rate and fan efficacy requirements, the clean-filter pressure drop for the system air filter shall conform to the requirements given in Table 150.0-B or 150.0-C. E. Air filter product labeling. Systems described in 150.0(m)12)Ai shall be equipped with air filters that have been labeled by the manufacturer to disclose the efficiency and pressure drop ratings that demonstrate conformance with Sections 150.0(m)12C and 150.0(m)12D. 13. Space conditioning system air flow rate and fan efficacy. Space conditioning systems that utilize forced air ducts to supply cooling to an occupiable space shall: A. Static pressure probe. Have a hole for the placement of a static pressure probe (HSPP), or a permanently installed static pressure probe (PSPP) in the supply plenum downstream of the air conditioning evaporator coil.

• CRSC § 160.2 High relevance — show source text

  space. iii. The supply side of mechanical balanced ventilation systems, including heat recovery ventilation systems, and energy recovery ventilation systems that provide outside air to an occupiable space. B. System design and installation. i. The system shall be designed to ensure that all recirculated air and all outdoor air supplied to the occupiable space are filtered before passing through any system's thermal conditioning components. Exception to Section 160.2(b)1Bi: For heat recovery ventilators and energy recovery ventilators, the location of the filters required by Section 160.2(b)1 may be downstream of a system thermal conditioning component, provided the system is equipped with ancillary filtration upstream of the system’s thermal conditioning component. ii. All systems shall be designed to accommodate the clean-filter pressure drop imposed by the system air filter(s). The design airflow rate, and maximum allowable clean-filter pressure drop at the design airflow rate applicable to each air filter, shall be determined and reported on labels according to Subsection iv below. Systems specified in Section 160.2(b)1Ai shall be equipped with air filters that meet either Subsection a or b below:

  a. Nominal 2-inch minimum depth filter(s) shall be sized by the system designer, or b. Nominal 1-inch minimum depth filter(s) shall be allowed if the filter(s) are sized according to Equation 160.2-A, based on a maximum face velocity of 150 ft per minute and according to the maximum allowable clean-filter pressure drop specified in Section 160.2(b)1Dii. (Equation 160.2-A) A face = Q filter /V face

  where:

  A face = air filter face area, the product of air filter nominal length × nominal width, ft [2] . Q filter = design airflow rate for the air filter, ft [3] /min V face = air filter face velocity ≤ 150 ft/min iii. All system air filters shall be located and installed in such a manner as to be accessible for regular service by the system owner. iv. All system air filter installation locations shall be labeled to disclose the applicable design airflow rate and the maximum allowable clean-filter pressure drop. The labels shall be permanently affixed to the air filter installation location, readily legible and visible to a person replacing the air filter. v. Filter racks or grilles shall use gaskets, sealing or other means to close gaps around inserted filters and prevent air from bypassing the filter. C. Air filter efficiency. The system shall be provided with air filters having a designated efficiency equal to or greater than MERV 13 when tested in accordance with ASHRAE Standard 52.2, or a particle size efficiency rating equal to or greater than 50 percent in the 0.30–1.0 μm range, and equal to or greater than 85 percent in the 1.0–3.0 μm range when tested in accordance with AHRI Standard 680.

  D. Air filter pressure drop. All systems shall be provided with air filters that conform to the applicable maximum allowable clean-filter pressure drop specified in Subsection i, ii, iii or iv below, when tested using ASHRAE Standard 52.2, or as rated using AHRI Standard 680, for the applicable design airflow rates for the system air filters. i. The maximum allowable clean-filter pressure drop shall be determined by the system design for the nominal 2inch minimum depth air filter required by Section 160.2(b)1Biia, or ii.

• CRSC § 120.1 High relevance — show source text

  i. Mechanical space-conditioning systems that supply air to an occupiable space through ductwork exceeding 10 ft (3 m) in length. ii. Mechanical supply-only ventilation systems and makeup air systems that provide outside air to an occupiable space. iii. The supply side of mechanical balanced ventilation systems, including heat recovery ventilation systems and energy recovery ventilation systems that provide outside air to an occupiable space.

  Exception to Section 120.1(c)1A: For heat recovery ventilators and energy recovery ventilators, the location of the filters required by Section 120.1(c)1A may be downstream of a system thermal conditioning component, provided the system is equipped with ancillary filtration upstream of the system’s thermal conditioning component. B. Air filter efficiency. The filters shall have a designated efficiency equal to or greater than MERV 13 when tested in accordance with ASHRAE Standard 52.2, or a particle size efficiency rating equal to or greater than 50 percent in the 0.30–1.0 μm range, and equal to or greater than 85 percent in the 1.0–3.0 μm range when tested in accordance with AHRI Standard 680; and

  C. Systems shall be equipped with air filters that meet either Subsection i or ii below. i. Nominal 2-inch minimum depth filter(s); or ii. Nominal 1-inch minimum depth filter(s) shall be allowed if the filter(s) are sized according to Equation 120.1-A, based on a maximum face velocity of 150 feet per minute.

  (Equation 120.1-A) A face = Q filter /V face

  Where:

  A face = air filter face area, the product of air filter nominal length × nominal width, ft [2] Q filter = design airflow rate for the air filter, ft [3] /min V face = air filter face velocity ≤ 150, ft/min D. Filter racks or grilles shall use gaskets, sealing or other means to close gaps around inserted filters and prevent air from bypassing the filter. Exception to Section 120.1(c)1: Evaporative coolers are not subject to the air filtration requirements of Section 120.1(c)1.

  2025 CALIFORNIA ENERGY CODE 65

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  NONRESIDENTIAL, HOTEL/MOTEL OCCUPANCIES, AND COVERED PROCESSES—MANDATORY REQUIREMENTS

  2. Natural ventilation. Naturally ventilated spaces shall be designed in accordance with 120.1(c)2A through 120.1(c)2D. A. Floor area to be ventilated. Spaces or portions of spaces to be naturally ventilated shall be located within a distance based on the ceiling height, as specified in i, ii and iii. The ceiling height ( H ) to be used in i, ii or iii shall be the minimum ceiling height in the space, or for ceilings that are increasing in height as distance from the operable openings is increased, the ceiling height shall be determined as the average height of the ceiling within 20 feet from the operable opening. [ASHRAE 62.1:6.4.1.1] i. Single side opening. For spaces with operable opening on one side of the zone, the naturally ventilated area shall extend to a distance not greater than two times the height (H) of the ceiling from the openings.

  [ASHRAE 62.1:6.4.1.3]

  ii. Double side opening.

• CRSC § 25218.5 High relevance — show source text

  Note: Authority: Sections 25213, 25218, 25218.5, 25402 and 25402.1, Public Resources Code . Reference: Sections 25007, 25008, 25218.5, 25310, 25402, 25402.1, 25402.4, 25402.5, 25402.8, and 25943, Public Resources Code.

  SECTION 120.1—REQUIREMENTS FOR VENTILATION AND INDOOR AIR QUALITY

  (a) General requirements.

  1. All occupiable spaces in hotel/motel buildings, and nonresidential buildings other than healthcare facilities shall comply with the applicable requirements of Section 120.1(a) through 120.1(g). Healthcare facilities shall be ventilated in accordance with Chapter 4 of the California Mechanical Code.

  2. The required outdoor air-ventilation rate and the air-distribution system design shall be clearly identified on the plans in accordance with Section 10-103 of Title 24, Part 1. (b) Reserved. (c) Nonresidential and hotel/motel buildings. All occupiable spaces shall meet the requirements of Section 120.1(c)1 and shall also comply with either Section 120.1(c)2 or Section 120.1(c)3.

  3. Air filtration.

  A. Mechanical system types specified in Subsections i, ii and iii below shall be designed to ensure that all recirculated air and all outdoor air supplied to the occupiable space is filtered before passing through any system thermal conditioning components. Air filters shall conform to the requirements of Sections 120.1(c)1B, 120.1(c)1C and 120.1(c)1D.

  i. Mechanical space-conditioning systems that supply air to an occupiable space through ductwork exceeding 10 ft (3 m) in length. ii. Mechanical supply-only ventilation systems and makeup air systems that provide outside air to an occupiable space. iii. The supply side of mechanical balanced ventilation systems, including heat recovery ventilation systems and energy recovery ventilation systems that provide outside air to an occupiable space.

  Exception to Section 120.1(c)1A: For heat recovery ventilators and energy recovery ventilators, the location of the filters required by Section 120.1(c)1A may be downstream of a system thermal conditioning component, provided the system is equipped with ancillary filtration upstream of the system’s thermal conditioning component. B. Air filter efficiency. The filters shall have a designated efficiency equal to or greater than MERV 13 when tested in accordance with ASHRAE Standard 52.2, or a particle size efficiency rating equal to or greater than 50 percent in the 0.30–1.0 μm range, and equal to or greater than 85 percent in the 1.0–3.0 μm range when tested in accordance with AHRI Standard 680; and

  C. Systems shall be equipped with air filters that meet either Subsection i or ii below. i. Nominal 2-inch minimum depth filter(s); or ii. Nominal 1-inch minimum depth filter(s) shall be allowed if the filter(s) are sized according to Equation 120.1-A, based on a maximum face velocity of 150 feet per minute.

  (Equation 120.1-A) A face = Q filter /V face

  Where:

• CRSC § 150.0 High relevance — show source text

  SINGLE-FAMILY RESIDENTIAL BUILDINGS— MANDATORY FEATURES AND DEVICES

  iii. The supply side of mechanical balanced ventilation systems, including heat recovery ventilation systems, and energy recovery ventilation systems that provide outside air to an occupiable space. Exception 1 to Section 150.0(m)12A: Evaporative coolers are not required to comply with the air filtration requirements in Section 150.0(m)12.

  B. System design and installation. i. The system shall be designed to ensure that all recirculated air and all outdoor air supplied to the occupiable space is filtered before passing through any system’s thermal conditioning components. Exception 1 to Section 150.0(m)12Bi: For heat recovery ventilators and energy recovery ventilators the location of the filters required by Section 150.0(m)12 may be downstream of a system thermal conditioning component, provided the system is equipped with ancillary filtration upstream of the system’s thermal conditioning component. ii. All systems shall be designed to accommodate the clean-filter pressure drop imposed by the system air filter(s). The design airflow rate and maximum allowable clean-filter pressure drop at the design airflow rate applicable to each air filter shall be determined and reported on labels according to Subsection iv below. Systems specified in Section 150.0(m)12Ai shall be equipped with air filters that meet either Subsection a or b below. a. Nominal two-inch minimum depth filter(s) shall be sized by the system designer, or b. Nominal one-inch minimum depth filter(s) shall be allowed if the filter(s) are sized according to Equation 150.0-A, based on a maximum face velocity of 150 ft per minute, and according to the maximum allowable clean-filter pressure drop specified in Section 150.0(m)12Dii. (Equation 150.0-A) A face = Q filter / V face

  where

  A face = air filter face area, the product of air filter nominal length x nominal width, ft [2] . Q filter = design airflow rate for the air filter, ft [3] /min. V face = air filter face velocity ≤ 150, ft/min. iii. All system air filters shall be located and installed in such a manner as to be accessible for regular service by the system owner. iv. All system air filter installation locations shall be labeled to disclose the applicable design airflow rate and the maximum allowable clean-filter pressure drop. The labels shall be permanently affixed to the air filter installation location, readily legible, and visible to a person replacing the air filter. v. Filter racks or grilles shall use gaskets, sealing or other means to close gaps around inserted filters to and prevent air from bypassing the filter. C. Air filter efficiency. The system shall be provided with air filter(s) having a designated efficiency equal to or greater than MERV 13 when tested in accordance with ASHRAE Standard 52.2, or a particle size efficiency rating equal to or greater than 50 percent in the 0.30 – 1.0 μm range, and equal to or greater than 85 percent in the 1.0 – 3.0 μm range when tested in accordance with AHRI Standard 680.

  D. **Air filter pressure drop.

• CRSC § 12-16 High relevance — show source text

  CHAPTER 12-16-1 ENGINEERING REGULATIONS—QUALITY

  AND DESIGN OF THE MATERIALS OF

  CONSTRUCTION . . . . . . . . . . . . . . . . . . . 101

  CHAPTER 12-16-2 ENGINEERING REGULATIONS—QUALITY

  AND DESIGN OF THE MATERIALS OF

  CONSTRUCTION . . . . . . . . . . . . . . . . . . . 103

  CHAPTER 12-31C RADIATION SHIELDING STANDARDS . . 105

  CHAPTER 12-71 AIR FILTERS. . . . . . . . . . . . . . . . . . . . . . . 107

  CHAPTER 12-72-1 PROTECTIVE SIGNALING SYSTEMS . . . 109

  CHAPTER 12-72-2 PROTECTIVE SIGNALING SYSTEMS . . . 123

  CHAPTER 12-72-3 PROTECTIVE SIGNALING SYSTEMS . . . 133

  HISTORY NOTE APPENDIX . . . . . . . . . . . . . . . . . . . . . . . . . . . 157

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  PART 12 CROSS REFERENCE TABLE

  (Cross reference table is nonregulatory, intended only as an aid to the code user.)

  PART 12 STANDARD	SUBJECT	ADOPTING AGENCY	ASSOCIATED TITLE 24 BUILDING STANDARD
  Chapter 12-3	Releasing systems for security bars in dwellings	SFM	Part 2, Sections 1031.2.1, 1031.6, 1032.7 Part 2.5, Sections R319.1.1 and R319.4.4 Part 9, Sections 1031.2.1, 1031.6, 1032.7 Appendix 4 Section 452.1.5 and Title 19 provisions 4.1, 4.2, 4.3, 4.4, 4.5, 4.6 reprinted in Part 9 Part 10, Section 505.4
  Chapter 12-4A	Laboratory animal quarters standards	DPH	Part 2, Section 1236
  Chapter 12-4-1	Stage and Platforms	SFM	Part 2, Sections 410.2.7, 410.2.7.1, 410.2.7.2 Part 9, Sections 105.6.51, 4809
  Chapter 12-7-1	Fire-resistive standards.

• CRSC § 12-16 High relevance — show source text

  CALIFORNIA STANDARD FOR RESIDENTIAL EXCESS FLOW ACTUATED AUTOMATIC GAS SHUTOFF VALVES (SEE CCR TITLE 24, PART 5, CHAPTER 12) STANDARD 12-16-2

  DIVISION OF THE STATE ARCHITECT

  Authority: Sections 19200–19204, Health and Safety Code. Reference: Sections 19201.5 and 19202, Health and Safety Code.

  DIVISION 1—CONSTRUCTION

  SCOPE

  Sec. 12-16-201. The American Society for Testing and Materials (ASTM) F2138-12(2017) Standard Specification for Excess Flow Valves for Natural Gas Service, and the American National Standards Institute (ANSI) Z21.93-2017/CSA 6.30-2017 Excess Flow Valves for Natural and LP Gas with Pressure up to 5 psig, shall be the applicable standards used by the Division of the State Architect for certification of these devices.

  Sec. 12-16-201.1. Each installation of a customer-owned device that satisfies this standard shall be in accordance with the California Plumbing Code (CCR Title 24, Part 5).

  2025 CALIFORNIA REFERENCED STANDARDS CODE 103

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  104 2025 CALIFORNIA REFERENCED STANDARDS CODE

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  12-31C RADIATION SHIELDING STANDARDS

  STANDARD 12-31C-1

  DEPARTMENT OF HEALTH SERVICES

  Authority: Sections 102, 208 and 25811.

  Reference: Sections 102, 208 and 436.5.

  ALL HEALING ARTS X-RAY INSTALLATIONS

  Sec. 12-31C-101. All radiation shielding barriers in rooms and enclosures housing radiation machines shall comply with the mandatory standards and appendices in Report No. 35, “Dental X-RAY Protection”; Report 49, “Structural Shielding Design and Evaluation for Medical use of X-rays and Gamma Rays of Energies up to 10 MeV”; and Report No. 51, “Radiation Protection Design Guidelines for 0.1-100 MeV Particle Accelerator Facilities.” Published by the National Council on Radiation Protection and Measurements, 7910 Woodmont Avenue, Bethesda, Maryland 20814.

  2025 CALIFORNIA REFERENCED STANDARDS CODE 105

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  106 2025 CALIFORNIA REFERENCED STANDARDS CODE

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  12-71 AIR FILTERS

  STANDARD 12-71-1

  STATE FIRE MARSHAL

  DESCRIPTION OF TEST APPARATUS, METHOD AND CLASSIFICATION REQUIREMENTS FOR AIR FILTERS

  Sec. 12-71-100.

  (a) Test apparatus.

  1. The test duct, made of M.S. gage galvanized sheet metal reinforced with angle irons, is 21 inches square (13 548 mm [2] ) and 13 [1] / 2 feet (4114 mm) long.
• CRSC § 12-10 High relevance — show source text

  CHAPTER 12-10-1 EXITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73

  CHAPTER 12-10-2 EXITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77

  CHAPTER 12-10-3 EXITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83

  CHAPTERS 12-11A AND 12-11B

  BUILDING AND FACILITY ACCESS

  SPECIFICATIONS. . . . . . . . . . . . . . . . . . . . 85

  CHAPTER 12-12 RESERVED . . . . . . . . . . . . . . . . . . . . . . . . . 87

  CHAPTER 12-13 STANDARDS FOR INSULATING

  MATERIAL. . . . . . . . . . . . . . . . . . . . . . . . . . 89

  CHAPTER 12-16-1 ENGINEERING REGULATIONS—QUALITY

  AND DESIGN OF THE MATERIALS OF

  CONSTRUCTION . . . . . . . . . . . . . . . . . . . 101

  CHAPTER 12-16-2 ENGINEERING REGULATIONS—QUALITY

  AND DESIGN OF THE MATERIALS OF

  CONSTRUCTION . . . . . . . . . . . . . . . . . . . 103

  CHAPTER 12-31C RADIATION SHIELDING STANDARDS . . 105

  CHAPTER 12-71 AIR FILTERS. . . . . . . . . . . . . . . . . . . . . . . 107

  CHAPTER 12-72-1 PROTECTIVE SIGNALING SYSTEMS . . . 109

  CHAPTER 12-72-2 PROTECTIVE SIGNALING SYSTEMS . . . 123

  CHAPTER 12-72-3 PROTECTIVE SIGNALING SYSTEMS . . . 133

  HISTORY NOTE APPENDIX . . . . . . . . . . . . . . . . . . . . . . . . . . . 157

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  PART 12 CROSS REFERENCE TABLE

  (Cross reference table is nonregulatory, intended only as an aid to the code user.)

• CRSC § 0.395 High relevance — show source text

  000 cfm1**|MULTI-
  ZONE VAV
  SYSTEMS
  > 10,000
  cfm1|ALL OTHER
  FAN
  SYSTEMS
  ≤ 5,000 cfm|ALL OTHER
  FAN
  SYSTEMS
  > 5,000 and
  ≤ 10,000 cfm|ALL OTHER
  FAN
  SYSTEMS
  > 10,000
  cfm1| |Supply system base allowance for AHU serving spaces ≤ 6 floors
  away)|0.395|0.453|0.413|0.232|0.256|0.236| |Supply system base allowance for AHU serving spaces > 6 floors
  away|0.508|0.548|0.501|0.349|0.356|0.325| |MERV 13 to MERV 16 filter upstream of thermal conditioning
  equipment (two times the clean filter pressure drop)2|0.136|0.114|0.105|0.139|0.120|0.107| |MERV 13 to MERV 16 final filter downstream of thermal
  conditioning equipment (two times the clean filter pressure
  drop)2|0.225|0.188|0.176|0.231|0.197|0.177| |Filtration allowance for > MERV 16 or HEPA filter (two times
  the clean filter pressure drop)2|0.335|0.280|0.265|0.342|0.292|0.264| |Central hydronic heating coil allowance|0.046|0.048|0.052|0.046|0.050|0.054| |Electric heat allowance|0.046|0.038|0.035|0.046|0.040|0.036| |Gas heat allowance|0.069|0.057|0.070|0.058|0.060|0.072| |Hydronic/DX cooling coil or heat pump coil (wet) allowance3|0.135|0.114|0.105|0.139|0.120|0.107| |Solid or liquid desiccant system allowance|0.157|0.132|0.123|0.163|0.139|0.124| |Reheat coil for dehumidification allowance|0.045|0.038|0.035|0.046|0.040|0.036| |Allowance for evaporative humidifier/cooler in series with a
  cooling coil. Value shown is allowed watts/cfm per 1.0 inch of
  water gauge (in. w.g.) Determine pressure loss (in. w.g.) at
  400 fpm or maximum velocity allowed by the manufacturer,
  whichever is less.[Calculation required, see Note 4]|0.224|0.188|0.176|0.231|0.197|0.177| |Allowance for 100% outdoor air system5|0.000|0.000|0.000|0.070|0.100|0.107| |Energy recovery allowance for 0.50 ≤ ERR < 0.556|0.135|0.114|0.105|0.139|0.120|0.