CRSC · California Referenced Standards Code
Which Title 24 code sections reference SFM 12-71-1 for filters and where to look
Some Title 24 sections (notably the California Mechanical Code ventilation and hood provisions) require air or grease filters to be tested and classified per SFM Standard 12-71-1. The CRSC test method and pass/fail numbers are in § 12-71-100 (test duct, 3‑minute flame exposure, 200 fpm airflow, and Class I if smoke-area < 1.5 sq in and no downstream flames). To show compliance: start at the Title 24 section that invokes SFM 12-71-1 (example: § 509.2.3 for grease filters or § 401.1/401.3 for ventilation filters), then attach a test report showing the SFM 12-71-1/§ 12-71-100 results.
Last reviewed: July 6, 2026
What the code requires — plain English (controlling §)
The California Referenced Standards Code establishes the State Fire Marshal test method and classification criteria for air and grease filters in § 12-71-100 (SFM 12-71-1) — including the test duct, flame exposure, airflow, smoke-density measurement and the Class I / Class 2 criteria. See § 12-71-100 for the full test apparatus, test method and classification rules .
If Title 24 requires a filter to be “Class I” or to meet the SFM filter rules, that is referring to the test and pass/fail thresholds defined in § 12-71-100 (SFM 12-71-1) .
Requirements in detail
Key defined terms and thresholds (first mention bolded): Class I, Class 2, MERV, § 12-71-100, § 509.2.3, § 401.1.
Which Title 24 sections point you to SFM 12-71-1
- Mechanical Code (Part 4) — ventilation/filters:
- § 401.1 (Applicability / Air filters): explicitly: “Air filters shall comply with all requirements of Part 12, Title 24, Chapter 12-71, SFM Standard 12-71-1.” See the California Mechanical Code text where the SFM reference appears .
- § 401.3 (Filters) includes related filter requirements (MERV requirements) and cross-references the SFM standard in the Mechanical Code context .
- Kitchen/hood/grease filter requirements:
- § 509.2.3 (Grease filters) — requires grease filters to be Class I when tested in accordance with SFM 12-71-1 for SFM-regulated applications; § 509.2.3.4 reiterates the Class I requirement tied to SFM 12-71-1 .
- Energy Code / other Title 24 parts:
- The CRSC cross-reference table maps Chapter 12-71 to Title 24 Part 4 (Sections noted above) and to Part 6, § 120.1 (see the cross-reference listing) — i.e., Part 6 also lists an association with the Chapter 12-71 standard; consult the referenced Title 24 Part 6 section(s) for any program-specific requirements .
(Short guide: look in the California Mechanical Code, Chapter 4 ventilation provisions — § 401.x — and in the exhaust/hood chapter — § 509.2.3 and § 509.2.3.4 — where SFM 12-71-1 is invoked. The CRSC cross-reference table shows these Title 24 locations linked to Chapter 12-71.)
What § 12-71-100 actually prescribes (decision-relevant items)
The controlling CRSC text in § 12-71-100 contains the test apparatus, method and classification rules you must use when a Title 24 section requires compliance with SFM 12-71-1. The major decision-relevant dimensions are summarized below (grounded in § 12-71-100) .
| Decision dimension | Value / requirement | Code Reference |
|---|---|---|
| Test duct size and construction | Duct 21 in square, ~13.5 ft long; metal construction; filter frame sized for one 20 × 20 in nominal filter | § 12-71-100 |
| Air velocity during test | Approximately 200 linear feet per minute at the discharge end | § 12-71-100 |
| Flame exposure | Two burners producing yellow wavering flames placed ~18 in from filter; flames applied 3 minutes | § 12-71-100 |
| Smoke-density measurement | Photoelectric cell records microammeter drop; area under curve measured (planimeter or calculated) | § 12-71-100 |
| Class I threshold | Area under smoke-density curve < 1.5 sq in and no downstream flames or sparks | § 12-71-100 |
| Class 2 threshold | Area under curve ≤ 6.0 sq in; may burn moderately but not project flames/sparks beyond discharge | § 12-71-100 |
| Adhesive coatings | Liquid adhesives on filters must have flash point ≥ 325 °F (Cleveland open cup) | § 12-71-100 (d) |
| Where Title 24 says “use SFM 12-71-1” | Mechanical Code ventilation sections (e.g., § 401.1, § 401.3) and grease-filter provisions (§ 509.2.3, § 509.2.3.4) — see CRSC cross-ref to Part 4 and Part 6 | CRSC cross-ref & Mechanical Code text |
How to use these references (where to look, step-by-step)
- Start at the Title 24 code section that applies to your work (example: kitchen hood → § 509.2.3) — the section will state the SFM standard requirement directly or by agency bracket [SFM] .
- Follow the cross-reference (CRSC) to Chapter 12-71 and then to § 12-71-100 to read the test apparatus, test method and classification details you must use for any required Class I certification .
- For air filtration requirements in ventilation systems, consult § 401.1 / § 401.3 and the CRSC linkage to Chapter 12-71 to determine whether SFM 12-71-1 applies to your occupancy or agency-regulated project .
Exceptions & special cases
- The CRSC text in § 12-71-100 is the test and classification method; Title 24 sections determine when this method is required. For example, only applications regulated by the Office of the State Fire Marshal (those called out with the [SFM] bracket in Title 24) will call for SFM 12-71-1 compliance (see the Mechanical Code wording) .
- If a Title 24 section requires a MERV rating (e.g., MERV 13 for certain HVAC filters in § 401.3), that is a separate performance requirement from SFM 12-71-1 (the SFM standard addresses flammability/smoke classification, not MERV filtration efficiency) — read both sections where both appear .
- If a product is listed or certified by a listing agency for closer clearances or specific hood assemblies, the listing terms may be permitted in lieu of other requirements — consult the applicable Title 24 listing language in the mechanical/hood sections (e.g., provisions allowing listed grease removal devices) .
Common mistakes
- Assuming MERV rating and SFM Class are interchangeable. They are different: MERV is filtration efficiency; SFM Class I/II is flame/smoke behavior under SFM 12-71-1. Check both Title 24 and § 12-71-100 for the applicable requirement(s) .
- Looking only at the CRSC test method and forgetting to verify which Title 24 sections actually require it. Always confirm the Title 24 adopting section (example: § 509.2.3 for grease filters; § 401.1/401.3 for ventilation air filters) and then go to § 12-71-100 for test details .
- Relying on product literature alone: if Title 24 requires Class I per SFM 12-71-1, you need documentation showing the product was tested to § 12-71-100 (SFM 12-71-1) and met the Class I criteria (smoke-area and flame/spark performance) .
Worked example — concrete scenario
Scenario: A commercial kitchen hood serving high-heat cooking installed in a building regulated by the Office of the State Fire Marshal.
- Title 24 (Mechanical Code) requires grease filters in SFM-regulated applications to be Class I when tested in accordance with SFM 12-71-1 — see § 509.2.3 and § 509.2.3.4 .
- To evaluate a candidate filter, read § 12-71-100 for the test: the filter (nominal 20 × 20 in) is exposed to flames for 3 minutes in a 21 in square duct at about 200 fpm; smoke-area and flame/spark projection are observed and measured .
- Classification decision: if test records show no downstream flames/sparks and the area under the smoke-density curve is 1.2 sq in (which is < 1.5 sq in), the filter is Class I and satisfies the Title 24 grease-filter requirement. If the measured area were 3.0 sq in, that is between 1.5 and 6.0 — the filter would be Class 2 and would not meet the Title 24 Class I requirement for SFM-regulated grease filters .
- Documentation to submit: test report referencing SFM 12-71-1 / § 12-71-100 with the measured smoke-area and flame/spark observations; tie that report to the Title 24 requirement in § 509.2.3 (or other applicable §) when showing compliance to the enforcing agency .
Related provisions (CRSC)
- § 12-71-100 — test apparatus, method and classification requirements for air filters (SFM Standard 12-71-1) — primary controlling text for filter flammability/smoke criteria .
Note: The CRSC material provided in the files lists Chapter 12-71 and maps it to Title 24 Part 4 (e.g., § 401.x, § 509.2.3/509.2.3.4) and to Part 6 § 120.1 in the cross-reference table; consult those Title 24 sections for the specific situations that invoke the SFM standard .
Code references
Grounded in the retrieved California Referenced Standards Code — click a citation to read the verbatim passage:
CRSC § 509.2.3 High relevance — show source text
509.2.3 Grease Filters. Grease filters shall be listed
and constructed of steel or other non-combustible material, and shall be of rigid construction that will not distort or crush under normal operation, handling, cleaning, or replacement. [SFM] For applications listed in Section 1.11.0 regulated by the Office of the State Fire Marshal, grease filters shall be Class I when tested in accordance with the test method in Title 24, Part 12, Chapter 12-71, SFM Standard 12-71-1.
509.2.3.1 Arrangement. Grease filters shall be arranged so that all exhaust air passes through the grease filters. [NFPA 96:6.2.3.4]
509.2.3.2 Accessibility. Grease filters shall be easily accessible for removal. [NFPA 96:6.2.3.5]
509.2.3.3 Angled Installation. Grease filters shall be installed at an angle not less than 45 degrees (0.79 rad) from the horizontal. [NFPA 96:6.2.3.6]
509.2.3.4 [DPH] Grease filters shall be Class I when tested in accordance with the test method in
SFM 12-71-1.
509.2.4 Grease Drip Trays. Grease filters shall be equipped with a grease drip tray beneath their lower edges. [NFPA 96:6.2.4.1]
509.2.4.1 Size and Pitch. Grease drip trays shall be kept to the minimum size needed to collect grease. Grease drip trays shall be pitched to drain into an enclosed metal container having a capacity not exceeding 1 gallon (4 L). [NFPA 96:6.2.4.2, 6.2.4.3]
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EXHAUST SYSTEMS
509.2.5 Grease Filter Orientation. Grease filters that require a specific orientation to drain grease shall be clearly so designated on the face of the filter as to be visible with the filter installed, or the hood or filter shall be constructed so that filters cannot be installed in the wrong orientation. [NFPA 96:6.2.5]
509.3 Solid-Fuel Grease Removal Devices. Where solid-fuel cooking equipment is provided with grease removal devices, these devices shall be in accordance with Section 517.0.
510.0 Exhaust Duct Systems.
510.1 General. Ducts shall not pass through fire walls.
[NFPA 96:7.1.1]
510.1.1 Fire Hazards. All ducts shall lead directly to the exterior of the building, so as not to unduly increase any fire hazard. [NFPA 96:7.1.2]
510.1.2 Interconnection. Duct systems shall not be interconnected with any other building ventilation or exhaust system. [NFPA 96:7.1.3]
CRSC § 403.7 High relevance — show source text
1
Table 403.7_Notes 11 & 12_
||||X|X||||||||||||||||||||This state agency does not adopt sections identified with the following symbol: The Office of the State Fire Marshal’s adoption of this chapter or individual sections is applicable to structures regulated by other state agencies pursuant to Section 1.11.0.
2025 CALIFORNIA MECHANICAL CODE 67
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CHAPTER 4
VENTILATION AIR
401.0 General.
401.1 Applicability. This chapter contains requirements for ventilation air supply, exhaust, and makeup air requirements for occupiable spaces within a building. [OSHPD 1, 1R, 2, 3, 4 & 5] See Sections 406.0 through 419.0. [SFM] Air filters shall comply with all requirements of Part 12, Title 24, Chap- ter 12-71, SFM Standard 12-71-1. Spaces within buildings, except those within a dwelling unit in residential occupancies where occupants are nontransient, shall comply with Section 402.0 through Section 404.0. Requirements for ventilation air rate for dwelling units in residential occupancies, where the occupants are nontransient, shall be in accordance with Section 405.0 or ASHRAE 62.2.
401.2 Indoor Swimming Pools. The design of ventilation systems serving an indoor aquatic facility (natatorium) shall comply with the Uniform Swimming Pool, Spa and Hot Tub Code (USPSHTC).
401.3 Filters. [BSC-CG & DSA-SS] In mechanically ven- tilated buildings, provide regularly occupied areas of the building with air filtration media for outside and return air that provides at least a Minimum Efficiency Reporting Value (MERV) of 13. MERV 13 filters shall be installed prior to occupancy, and recommendations for maintenance with fil- ters of the same value shall be included in the operation and maintenance manual in compliance with Chapter 5, Division 5.5 of the California Green Building Standards Code (CAL- Green).
Exception: Existing mechanical equipment.
401.3.1 Labeling. Installed filters shall be clearly labeled by the manufacturer indicating the MERV rating.
402.0 Ventilation Air.
402.1 Occupiable Spaces. Occupiable spaces listed in Table 402.1 shall be designed to have ventilation (outdoor) air for occupants in accordance with this chapter. [DSA-SS] Ven- tilation air requirements for occupancies regulated by the California Energy Commission are found in the California Energy Code.
[CEC] Ventilation air requirements for occupancies regu- lated by the California Energy Commission and found in the California Energy Code supersede those of the California Mechanical Code.
CRSC § 416.2 High relevance — show source text
0_
414.0
415.0
416.0 – 416.2
416.3
416.4
417.0
418.0
419.0
Table 4-A
Table 4-B
Table 4-C
Table 402.1
Table 403.7_Notes 11 & 12_
|X|||||||X||||||||||||||||| |Adopting Agency
Adopt Entire Chapter
Adopt Entire Chapter as
amended (amended sections
listed below)
Adopt only those sections
that are listed below
Chapter/Section
401.1
401.3
401.3.1
402.1
402.1.2
402.2
402.3
403.0
403.7.2.1 – 403.7.2.4
405.3
406.0
407.0
408.0
409.0
410.0
411.0
412.0
413.0
414.0
415.0
416.0 – 416.2
416.3
416.4
417.0
418.0
419.0
Table 4-A
Table 4-B
Table 4-C
Table 402.1
Table 403.7_Notes 11 & 12_
||||X|X||||||||||||||||||||This state agency does not adopt sections identified with the following symbol: The Office of the State Fire Marshal’s adoption of this chapter or individual sections is applicable to structures regulated by other state agencies pursuant to Section 1.11.0.
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CHAPTER 4
VENTILATION AIR
401.0 General.
401.1 Applicability. This chapter contains requirements for ventilation air supply, exhaust, and makeup air requirements for occupiable spaces within a building. [OSHPD 1, 1R, 2, 3, 4 & 5] See Sections 406.0 through 419.0. [SFM] Air filters shall comply with all requirements of Part 12, Title 24, Chap- ter 12-71, SFM Standard 12-71-1. Spaces within buildings, except those within a dwelling unit in residential occupancies where occupants are nontransient, shall comply with Section 402.0 through Section 404.0. Requirements for ventilation air rate for dwelling units in residential occupancies, where the occupants are nontransient, shall be in accordance with Section 405.0 or ASHRAE 62.2.
CRSC § 509.2 High relevance — show source text
(2) Where a grease removal device is listed for separation distances less than those required in Section
509.2 and Section 509.2.1, the listing requirements shall be permitted. [NFPA 96:6.2.1.4]
(3) Grease removal devices supplied as part of listed hood assemblies shall be installed in accordance with the terms of the listing and the manufacturer’s instructions. [NFPA 96:6.2.1.5]
509.2.2 Grease Removal Device Protection. Where the distance between the grease removal device and the appliance flue outlet (heat source) is less than 18 inches (457 mm), grease removal devices shall be protected from combustion gas outlets and from direct flame impingement occurring during normal operation of cooking appliances producing high flue gas temperatures.
[NFPA 96:6.2.2.1]
509.2.2.1 Installation. This protection shall be permitted to be accomplished by the installation of a steel or stainless steel baffle plate between the heat source and the grease removal device. [NFPA 96:6.2.2.2]
509.2.2.2 Size and Location. The baffle plate shall be sized and located so that flames or combustion gases travel a distance not less than 18 inches (457 mm) from the heat source to the grease removal device. [NFPA 96:6.2.2.3]
509.2.2.3 Clearance. The baffle shall be located not less than 6 inches (152 mm) from the grease removal device. [NFPA 96:6.2.2.4]
509.2.3 Grease Filters. Grease filters shall be listed
and constructed of steel or other non-combustible material, and shall be of rigid construction that will not distort or crush under normal operation, handling, cleaning, or replacement. [SFM] For applications listed in Section 1.11.0 regulated by the Office of the State Fire Marshal, grease filters shall be Class I when tested in accordance with the test method in Title 24, Part 12, Chapter 12-71, SFM Standard 12-71-1.
509.2.3.1 Arrangement. Grease filters shall be arranged so that all exhaust air passes through the grease filters. [NFPA 96:6.2.3.4]
509.2.3.2 Accessibility. Grease filters shall be easily accessible for removal. [NFPA 96:6.2.3.5]
509.2.3.3 Angled Installation. Grease filters shall be installed at an angle not less than 45 degrees (0.79 rad) from the horizontal. [NFPA 96:6.2.3.6]
509.2.3.4 [DPH] Grease filters shall be Class I when tested in accordance with the test method in
SFM 12-71-1.
509.2.4 Grease Drip Trays. Grease filters shall be equipped with a grease drip tray beneath their lower edges. [NFPA 96:6.2.4.1]
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.
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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.
- 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.
- 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.
- 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.
- 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.
- 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 § 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).
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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.
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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.
- 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 § 12-7 Medium relevance — show source text
Fire tests of building
construction and materials.|SFM|Part 2, Section 703| |Chapter 12-7-2|Reserved||| |Chapter 12-7-3|Fire-resistive standards.
Fire testing furnaces.|SFM|Part 9, Section 3001| |Chapter 12-7-4|Fire-resistive standards.
Fire door assembly tests.|SFM|Part 2, Section 716| |Chapter 12-7-5|Fire-resistive standards. Interior
finish of decorative material.|SFM|Part 2, Chapter 8
Part 9, Chapter 8| |Chapter 12-7A|Materials and construction methods for
exterior wildfire exposure|SFM|Part 7, Chapter 5| |Chapter 12-8-1|Fire-resistive standards for fire protection|SFM|Part 2, Sections 408.14 and 435.6.2| |Appendix 12-8-1A|Calculation of the total rate of heat and carbon
monoxide or carbon dioxide production|SFM|| |Appendix 12-8-1B|Guide to mounting techniques for wall and
ceiling interior finish material|SFM|| |Chapter 12-10-1|Exits. Power-operated exit doors.|SFM|Part 2, Sections 408.4.2, 1010.1.4.2, 1010.1.9.1| |Chapter 12-10-2|Exits. Single-point latching or locking devices.|SFM|Part 2, Section 1010.2.2
Part 9, Section 1010.2.2| |Chapter 12-10-3|Exits. Emergency exit and panic hardware.
|SFM|Part 9, Section 1009.12| |Chapter 12-11A,
12-11B|Detectable warning products and directional
surfaces|DSA|Part 2, Sections 1112A.9, 1116A.5, 11B-247,
11B-406.5.12, 11B-705, 11B-810.5.2| |Chapter 12-12|Reserved||| |Chapter 12-13|Standards for insulating material|CA/SFM|Part 2.5, Section R302.10.1
Part 6, Section 110.8
Part 9, Section 720, Table 721.1(1)
Part 11, Section A5.504.4.8| |Chapter 12-16-1|California standard for earthquake-actuated
automatic gas shutoff systems|DSA|Part 2, Chapters 16 and 16A
Part 5, Section 1211.8| |Chapter 12-16-2|California standard for residential excess flow
actuated automatic gas shutoff valves|DSA|Part 5, Section 1209.1| |Chapter 12-31C|Radiation shielding|DPH|Part 2, Section 3102C| |Chapter 12-71|Air filters|SFM|Part 4, Sections 401.2, 509.2.3, 509.2.3.4
Part 6, Section 120.1| |Chapter 12-72-1|Protective signaling systems.
Standard test procedures.|SFM|| |Chapter 12-72-2|Protective signaling systems.CRSC § 12-16 Medium 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
STANDARDSUBJECT ADOPTING
AGENCYASSOCIATED TITLE 24
BUILDING STANDARDChapter 12-3 Releasing systems for security bars in
dwellingsSFM 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 505.4Chapter 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, 4809Chapter 12-7-1 Fire-resistive standards. CRSC § 12-71 Medium 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.
- 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.
- 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.
- 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.
- 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.
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.
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.
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:
- 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] ).
- 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 § 1009.12 Medium relevance — show source text
Emergency exit and panic hardware.
|SFM|Part 9, Section 1009.12| |Chapter 12-11A,
12-11B|Detectable warning products and directional
surfaces|DSA|Part 2, Sections 1112A.9, 1116A.5, 11B-247,
11B-406.5.12, 11B-705, 11B-810.5.2| |Chapter 12-12|Reserved||| |Chapter 12-13|Standards for insulating material|CA/SFM|Part 2.5, Section R302.10.1
Part 6, Section 110.8
Part 9, Section 720, Table 721.1(1)
Part 11, Section A5.504.4.8| |Chapter 12-16-1|California standard for earthquake-actuated
automatic gas shutoff systems|DSA|Part 2, Chapters 16 and 16A
Part 5, Section 1211.8| |Chapter 12-16-2|California standard for residential excess flow
actuated automatic gas shutoff valves|DSA|Part 5, Section 1209.1| |Chapter 12-31C|Radiation shielding|DPH|Part 2, Section 3102C| |Chapter 12-71|Air filters|SFM|Part 4, Sections 401.2, 509.2.3, 509.2.3.4
Part 6, Section 120.1| |Chapter 12-72-1|Protective signaling systems.
Standard test procedures.|SFM|| |Chapter 12-72-2|Protective signaling systems. Single-and
multiple-station fire alarm devices
mechanically operated type.|SFM|| |Chapter 12-72-3|Protective signaling systems. Smoke detectors,
combustion products type.|SFM||2025 CALIFORNIA REFERENCED STANDARDS CODE ix
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x 2025 CALIFORNIA REFERENCED STANDARDS CODE
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12-1 ADMINISTRATION
RESERVED
2025 CALIFORNIA REFERENCED STANDARDS CODE 1
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2 2025 CALIFORNIA REFERENCED STANDARDS CODE
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12-3 RELEASING SYSTEMS FOR SECURITY BARS IN DWELLINGS
(This standard includes provisions of Underwriters Laboratories Subject 2326, Appendix B, dated December 17, 1999, reprinted with their permission.)
INTRODUCTION
SECTION 12-3-1—SCOPE
12-3-1.1 These requirements cover releasing systems for bars, grilles, mesh, glazing or other items intended to provide security at doors and windows required for emergency escape from dwelling units. When actuated by the occupant, the system allows the obstructions over the door or window to be moved so occupants can escape in the event of an emergency.
CRSC § 5.303.6 Medium relevance — show source text
3**
Water
Efficiency and
Conservation|Mandatory|Standards for plumbing fixtures and fittings|5.303.6||||| |DIVISION 5.3
Water
Efficiency and
Conservation|Mandatory|Outdoor potable water use in landscape areas (with notes)|5.304.1||||| |DIVISION 5.4
Material
Conservation
and Resource
Efficiency
(continued)|Mandatory|Weather protection|5.407.1||||| |DIVISION 5.4
Material
Conservation
and Resource
Efficiency
(continued)|Mandatory|Moisture control: sprinklers|5.407.2.1||||| |DIVISION 5.4
Material
Conservation
and Resource
Efficiency
(continued)|Mandatory|Moisture control: exterior door protection|5.407.2.2.1||||| |DIVISION 5.4
Material
Conservation
and Resource
Efficiency
(continued)|Mandatory|Moisture control: flashing|5.407.2.2.2||||| |DIVISION 5.4
Material
Conservation
and Resource
Efficiency
(continued)|Mandatory|Construction waste management—comply with either:
Sections 5.408.1.1, 5.408.1.2, 5.408.1.3 or more stringent
local ordinance|5.408.1.1,
5.408.1.2,
5.408.1.3||||| |DIVISION 5.4
Material
Conservation
and Resource
Efficiency
(continued)|Mandatory|Construction waste management: documentation|5.408.1.4||||| |DIVISION 5.4
Material
Conservation
and Resource
Efficiency
(continued)|Mandatory|Universal waste [A]|5.408.2||||| |DIVISION 5.4
Material
Conservation
and Resource
Efficiency
(continued)|Mandatory|Excavated soil and land clearing debris (100% reuse or
recycle) with Exception and Notes|5.408.3||||| |DIVISION 5.4
Material
Conservation
and Resource
Efficiency
(continued)|Mandatory|Life Cycle Assessment, Scope, Whole building life cycle
assessment with Notes, Building components, Reference
study period, and Verification of compliance|5.409.1,
5.409.2,
5.409.2.1,
5.409.2.2 and
5.409.2.3||||| |**DIVISION 5.CRSC § 5.4 Medium relevance — show source text
on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.
APPENDIX A5 — NONRESIDENTIAL VOLUNTARY MEASURES
CHAPTER 5 DIVISIONS Col2 Col3 SECTION TITLE CODE
SECTIONY N O PLAN SHEET,
SPEC OR
ATTACH(continued)
DIVISION 5.4
Material
Conservation
and Resource
EfficiencySelect Three
(cont’d)Elective Concrete manufacture, Recycled aggregates A5.405.5.3,
A5.405.5.3.1(continued)
DIVISION 5.4
Material
Conservation
and Resource
EfficiencySelect Three
(cont’d)Elective Concrete manufacture, Mixing water A5.405.5.3,
A5.405.5.3.2(continued)
DIVISION 5.4
Material
Conservation
and Resource
EfficiencySelect Three
(cont’d)Elective Concrete manufacture, High strength concrete A5.405.5.3,
A5.405.5.3.3(continued)
DIVISION 5.4
Material
Conservation
and Resource
EfficiencySelect Three
(cont’d)Elective Concrete manufacture, Later ages of maturity A5.405.5.3,
A5.405.5.3.4(continued)
DIVISION 5.4
Material
Conservation
and Resource
EfficiencySelect Three
(cont’d)Elective Concrete manufacture, Returned fresh concrete A5.405.5.3,
A5.405.5.3.5(continued)
DIVISION 5.4
Material
Conservation
and Resource
EfficiencySelect Three
(cont’d)Elective Choice of materials A5.406.1, A5.406.1.1,
A5.406.1.2, A5.406.1.3(continued)
DIVISION 5.4
Material
Conservation
and Resource
EfficiencySelect Three
(cont’d)Elective Life cycle assessment: Scope with exceptions, Whole
building life cycle assessment, Tier 2 with Exception,
Verification of complianceA5.409.1, A5.409.2,
A5.409.2.2, A5.409.2.3(continued)
**DIVISION 5.
Frequently asked questions
Do all HVAC filters need testing to SFM 12-71-1?
No. Title 24 sections specify when SFM 12-71-1 applies. Mechanical Code ventilation sections for some occupancies and SFM-bracketed applications call it out (see § 401.1 / § 401.3 and § 509.2.3 where applicable) — check the Title 24 adoption text, then use § 12-71-100 for test details .
Where in the code do I find the Class I pass threshold?
The Class I threshold (no downstream flames/sparks and smoke-area under the curve < 1.5 sq in) is in § 12-71-100 (classification criteria) .
If a filter is listed by a testing lab, does that satisfy Title 24?
A valid listing that specifically states testing to SFM 12-71-1 / § 12-71-100 and shows Class I results should satisfy the Title 24 requirement that calls for SFM 12-71-1 compliance (evidence must tie the listing/test report to § 12-71-100) .
Where does the Mechanical Code invoke SFM 12-71-1?
See the Mechanical Code ventilation sections: § 401.1 (air filters must comply with Chapter 12-71) and the grease-filter provisions § 509.2.3 / § 509.2.3.4 (Class I when tested per SFM 12-71-1) — cross-referenced in the CRSC index .
How do I locate the exact SFM test details for submittals?
Open the CRSC Chapter 12-71 and go to § 12-71-100 for the test duct, velocities, flame conditions, smoke-measurement method and Class I/Class 2 numeric thresholds; include that test report or lab listing in your submittal to show compliance with the Title 24 section that requires SFM 12-71-1 .
More in California Referenced Standards Code
- Administration and scope — CRSC Chapter 12 overview
- Air filter standards (Chapter 12‑71)
- Building and facility access / accessibility standards (Chapters 12‑11A, 12‑11B)
- Engineering regulations — quality and design of construction materials (12‑16 series)
- Exits and means of egress (Chapters 12‑10 series)
- Protective signaling systems and detectors (Chapters 12‑72‑1, ‑2, ‑3)
- Radiation shielding standards (Chapter 12‑31C)
- Referenced standards index / cross‑reference table (Part 12 listing of referenced standards)
- Releasing systems for security bars (egress-release standards)
- Standards for insulating materials (Chapter 12‑13)
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