CRSC · California Referenced Standards Code

Which CRSC provisions specify fire-resistive and fire-door assembly test standards?

The CRSC requires fire‑resistance testing to specific SFM methods: Chapter 12‑7‑1 sets general test conditions, 12‑7‑3 prescribes furnace design, 12‑7‑4 details fire‑door testing (temperatures, mounting, hose‑stream, reports and acceptance), and 12‑7‑5 covers decorative interior finish tests. Key numeric limits (furnace openings, thermocouple pads, hose pressures and durations, specimen sizes) are in the cited sections.

Ask a question free See coverage

Last reviewed: July 6, 2026

What the code requires — plain English

The California Referenced Standards Code requires that fire tests of building construction and materials, including fire door assemblies and interior decorative finishes, be performed to specific test methods, furnace designs, temperature measurement, hose‑stream exposures and acceptance criteria found in Chapters 12-7-1, 12-7-3, 12-7-4, and 12-7-5. In short: Chapter 12-7-1 sets general test conditions (including hose‑stream tables), Chapter 12-7-3 controls furnace design and correlation, Chapter 12-7-4 prescribes the full fire‑door assembly test method (temperatures, mounting, hose‑stream, report, acceptance), and Chapter 12-7-5 covers tests for interior decorative finishes. See the controlling sections § 12-7-1, § 12-7-300/§ 12-7-301, § 12-7-400 – § 12-7-406, and § 12-7-500 – § 12-7-501 for the authoritative text.

Most important rule: Fire-resistance tests must be run in furnaces that meet the SFM furnace requirements, temperatures on the unexposed side must be recorded with specified thermocouple pads, and assemblies must survive the fire‑endurance period plus the prescribed hose‑stream exposure to be classified.

Requirements in detail

Which chapters and key sections apply (short list)

  • General test conditions and hose‑stream schedule — § 12-7-1.
  • Furnace design / test equipment — § 12-7-300 and § 12-7-301 (vertical/horizontal furnace dimensions).
  • Fire door assembly tests (scope, mounting, temperatures, hose‑stream, report, acceptance) — § 12-7-400 through § 12-7-406.
  • Interior decorative finish tests (specimen size, exposure, acceptance) — § 12-7-500 and § 12-7-501.

Fire‑testing furnaces (what the code requires)

  • Furnaces used for fire‑door tests must conform to SFM furnace rules (large-scale vertical, half‑scale vertical, horizontal as applicable) — see § 12-7-301 for minimum opening areas and dimensions.
  • Furnace pressure: maintain as nearly equal to atmospheric as possible (horizontal furnaces may run slightly negative).

Table — furnace dimensions and key limits

Decision dimension Required value Code Reference
Vertical large‑scale wall furnace opening ≥ 200 sq ft, neither dimension < 9 ft § 12-7-301(a)
Vertical half‑scale wall furnace opening ≥ 50 sq ft, neither dimension < 7 ft § 12-7-301(b)
Horizontal large‑scale floor furnace opening ≥ 180 sq ft, neither dimension < 12 ft § 12-7-301(c)

Fire‑door assembly test procedure (key elements)

  • Scope / intent: tests apply to door assemblies that retard flame/heat/smoke but do not certify post‑fire serviceability — see § 12-7-400(b–c).
  • Unexposed surface temperature measurement: at least 3 thermocouples, with at least one thermocouple per 16 sq ft of door area; thermocouples under 6" × 6" felted asbestos pads, 0.40" thick — see § 12-7-402(b–c).
  • Test assembly mounting, clearances and mounting rules are specified (swinging doors open into furnace, clearances at edges and bottom, floor projection twice door thickness, etc.) — see § 12-7-403.

Table — location, pads and clearances (decision‑relevant)

Item Value / limit Code Reference
Minimum thermocouples 3 (≥1 per 16 sq ft area) § 12-7-402(b)
Thermocouple pad 6" × 6", 0.40" thick, ~0.026 lb § 12-7-402(c)
Bottom clearance (single swing door) 3/8 inch (tolerance noted) § 12-7-403(b)(9–11)
Floor segment into furnace ~2× door thickness (noncombustible) § 12-7-403(a)(2)

Hose‑stream (impact/erosion/cooling) — how much water and for how long

  • After the fire endurance exposure the assembly is subjected to a hose stream per the table in Chapter 12‑7‑4 (Table 12‑7‑4A) — nozzle, distance, and stream pattern are all specified in § 12-7-404(c) and Table 12‑7‑4A.

Table — Table 12‑7‑4A (hose stream values)

Desired fire rating Water pressure at base of nozzle (psi) Duration (sec per sq ft) Code Reference
3 hours 45 psi 3 sec/ft² § 12-7-404(c) (Table 12‑7‑4A)
1½ – <3 hours 30 psi 1.5 sec/ft² § 12-7-404(c) (Table 12‑7‑4A)
1 – <1½ hours 30 psi 0.9 sec/ft² § 12-7-404(c) (Table 12‑7‑4A)
< 1 hour 30 psi 0.6 sec/ft² § 12-7-404(c) (Table 12‑7‑4A)
  • Nozzle distance and tip dimensions are specified (2½‑inch hose, 1‑1/8" discharge tip, nozzle 20 ft from centerline, max deviation 30° — § 12‑7‑404(c)).

Report and conditions of acceptance

  • Test reports must document construction, mounting details, temperature records and observations; ratings reported may be 20 min, 30 min, 45 min, 1 hr, 1½ hr or 3 hr — see § 12-7-405.
  • Acceptance: assembly must remain in opening and not develop openings through the assembly; limited glass light fragment dislodgement tolerated; flaming limits on unexposed surface apply (no flaming in first 30 minutes, restricted flaming thereafter) — see § 12-7-406.

Interior decorative finish tests (Chapter 12‑7‑5)

  • Scope: applies to unframed and framed rigid combustible decorative materials used as screens, folding doors, etc. — § 12-7-500.
  • Specimen size and flame exposure for unframed rigid combustible decorative material: specimen 12" × 24", four specimens (two in each orientation); exposed 2" above a 3/8" Bunsen burner flame (4" flame) at corners and at least one point along lower edge for ≥ 20 seconds; acceptance limits are listed in § 12-7-501 (no sustained flaming beyond exposure area, flame shall not reach top, ≤1 s after‑flame, etc.).

Table — interior finish specimen and acceptance (decision‑relevant)

Item Value / limit Code Reference
Specimen size 12" × 24" § 12-7-501(a)(1)
Number of specimens 4 (two in each direction) § 12-7-501(a)(1)
Burner flame length 4 inches; exposure points: corners + ≥1 along lower edge; duration ≥ 20 s each § 12-7-501(a)(2–4)
Acceptance No sustained flaming beyond exposure, flame shall not reach top, ≤1 s after‑flame (see § text) § 12-7-501(a)(5)

Exceptions & special cases

  • The hose‑stream test is not required for opposite‑swing double egress exit doors, and for doors with fire‑endurance ratings less than 45 minutes (with or without approved wired glass lights) — see § 12-7-406.
  • Half‑scale furnace testing may be used for doors not exceeding 4 ft × 7 ft‑2 in when evaluating hardware or smaller constructions — see § 12-7-401(b).
  • Correlation tests are required when comparing exposures from different approved listing‑agency furnaces; Chapter 12‑7‑3 § 12‑7‑305 describes correlation procedures and required specimen types.

If you need a ruling on whether a specific door/frame/hardware combination may be tested half‑scale or requires full‑scale correlation, refer to § 12‑7‑401(b) and § 12‑7‑305 and consult the listing agency or SFM.

Common mistakes

  • Assuming the test certifies post‑fire serviceability — Chapter 12‑7‑4 § 12‑7‑400(b) explicitly states tests “register performance” but do not determine post‑fire suitability.
  • Using incorrect hose‑stream pressure/duration or nozzle distance — Table 12‑7‑4A and § 12‑7‑404 give exact values; misapplying these is a frequent error.
  • Failing to place thermocouples as required (≥1 per 16 sq ft, not over reinforcements or within 12" of door edge) or using wrong thermocouple pads — see § 12‑7‑402.
  • Forgetting to document mounting details, hardware, finish, and clearances in the test report — required by § 12‑7‑403 and § 12‑7‑405.

Worked example — apply the rule with numbers

Scenario: a single, side‑hinged fire door assembly is being tested for a 1½‑hour (90 minute) fire‑endurance classification. Key steps and numbers:

  1. Use a furnace conforming to SFM vertical large‑scale or vertical half‑scale rules as allowed; if full‑scale is required use the § 12‑7‑301 dimensions.
  2. Record unexposed surface temperatures with at least 3 thermocouples (≥1 per 16 sq ft). Thermocouples under 6" × 6" asbestos pads, 0.40" thick, per § 12‑7‑402(c).
  3. Run the fire endurance until 1½ hours (the target classification), then immediately perform the hose stream per Table 12‑7‑4A: for 1½ hours and over if less than 3 hours apply 30 psi at the base of the nozzle, for 1.5 seconds per square foot of exposed area.
    • If the exposed door area is 20 ft², hose‑stream duration = 1.5 sec/ft² × 20 ft² = 30 seconds (spraying per the specified pattern and nozzle distance of 20 ft).
  4. Report construction and mounting details, furnace and unexposed temperature records, observations, and the performance (pass/fail against § 12‑7‑406 acceptance limits).

Related provisions (quick links)

  • § 12-7-300 — Scope for fire‑testing furnaces (design & control).
  • § 12-7-301 — Furnace dimensions (vertical/horizontal).
  • § 12-7-305 — Correlation tests for furnace exposure equivalency.
  • § 12-7-400 — Fire door assembly tests: scope & intent.
  • § 12-7-401 — Fire testing furnaces & half‑scale allowance for doors.
  • § 12-7-402 — Unexposed surface temperatures and thermocouple pads.
  • § 12-7-403 — Test assembly construction, mounting, clearances.
  • § 12-7-404 — Conduct of tests; hose‑stream procedure and nozzle details.
  • § 12-7-405 — Test report requirements.
  • § 12-7-406 — Conditions of acceptance (flaming limits, hardware).
  • § 12-7-500 and § 12-7-501 — Interior finish (decorative) test procedures.

Code references

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

  • CRSC § 12-3 High relevance — show source text

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

    viii 2025 CALIFORNIA REFERENCED STANDARDS CODE

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

    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. 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.
  • CRSC § 12-7 High 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 § 12-7 High relevance — show source text

    (e) Furnace pressure. The pressure in the furnace chamber during the fire test shall be maintained as nearly equal to atmospheric pressure as possible. Horizontal furnaces may be operated at a slight negative pressure sufficient to reduce haze permitting visual observation. Furnace stacks shall be equipped with dampers to facilitate maintenance of furnace pressure.

    CORRELATION

    Sec. 12-7-305. Tests of specific assemblies of materials shall be conducted for correlation (or correlation factor) of furnace exposure by comparison with tests of identical assemblies and materials conducted in furnaces of “Approved Listing Agencies” which furnaces are deemed as conforming to the design and operating requirements of this standard.

    Correlation tests of wall furnaces shall include tests of two assemblies, one combustible and one noncombustible.

    Correlation tests of horizontal furnaces dependent on intended test specimens shall include at least one test for each type of assembly such as combustible ceiling-floor assembly, noncombustible assembly having a high thermal capacity floor for heat dissipation, noncombustible assembly having an insulating concrete floor or other type of design.

    Comparison of test results shall provide evidence of equivalent exposure based on transmitted temperatures on the unexposed side, on structural framing members, on the underside of floor or roof decks, and in the plenum space.

    28 2025 CALIFORNIA REFERENCED STANDARDS CODE

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

    FIRE-RESISTIVE STANDARDS

    2025 CALIFORNIA REFERENCED STANDARDS CODE 29

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

    30 2025 CALIFORNIA REFERENCED STANDARDS CODE

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

    12-7-4 FIRE-RESISTIVE STANDARDS

    FIRE DOOR ASSEMBLY TESTS

    STANDARD 12-7-4

    STATE FIRE MARSHAL

    SCOPE

    Sec. 12-7-400.

    (a) Application. These methods of fire tests are applicable to door assemblies of various materials and types of construction for use in wall openings to retard the passage of fire (flame, heat and smoke).

    (b) Performance. Tests made in conformity with these test methods will register performance during the test exposure, but such tests shall not be construed as determining suitability for use after exposure to fire.

    (c) Suitability of assemblies. It is the intent that tests made in conformity with these test methods will develop data to enable enforcing agencies to determine the suitability of door assemblies for use in locations where fire resistance of a specified duration is required.

    FIRE TESTING FURNACES AND CONTROL

    Sec. 12-7-401.

    (a) Furnaces. Fire testing furnaces and their control shall conform to SFM 12-7-3, Fire Testing Furnaces, Section 12-7-301 (a), Vertical Large-scale Wall Furnaces.

  • CRSC § 12-7 High relevance — show source text

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

    FIRE-RESISTIVE STANDARDS

    2025 CALIFORNIA REFERENCED STANDARDS CODE 29

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

    30 2025 CALIFORNIA REFERENCED STANDARDS CODE

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

    12-7-4 FIRE-RESISTIVE STANDARDS

    FIRE DOOR ASSEMBLY TESTS

    STANDARD 12-7-4

    STATE FIRE MARSHAL

    SCOPE

    Sec. 12-7-400.

    (a) Application. These methods of fire tests are applicable to door assemblies of various materials and types of construction for use in wall openings to retard the passage of fire (flame, heat and smoke).

    (b) Performance. Tests made in conformity with these test methods will register performance during the test exposure, but such tests shall not be construed as determining suitability for use after exposure to fire.

    (c) Suitability of assemblies. It is the intent that tests made in conformity with these test methods will develop data to enable enforcing agencies to determine the suitability of door assemblies for use in locations where fire resistance of a specified duration is required.

    FIRE TESTING FURNACES AND CONTROL

    Sec. 12-7-401.

    (a) Furnaces. Fire testing furnaces and their control shall conform to SFM 12-7-3, Fire Testing Furnaces, Section 12-7-301 (a), Vertical Large-scale Wall Furnaces.

    (b) Half scale. If the proposed conditions of use limit the construction to smaller dimensions, and for the evaluation of hardware intended for use on doors not exceeding 4 feet (1219 mm) in width by 7 feet 2 inches (2184 mm) in height, fire testing furnaces conforming to Section 12-7-301 (b), Vertical Half-scale Wall Furnace, may be utilized. Constructions and hardware for ceiling access doors intended for use in fire-endurance rated ceiling-floor assemblies shall be tested in furnaces conforming to SFM 12-7-3, Section 12-7-301 (b), (d) or (f).

    UNEXPOSED SURFACE TEMPERATURES

    Sec. 12-7-402.

    (a) Temperatures recorded. The unexposed surface temperatures of all fire door assemblies shall be recorded. The unexposed surface temperature shall be determined in the manner specified in Sections 12-7-402 (b), (c) and (d).

    (b) Surface temperature locations. Unexposed surface temperatures shall be taken at not less than three points, with at least one thermocouple in each 16 square foot (1.5 m [2] ) area of the door(s). Thermocouples shall not be located over reinforcements extending through the door, over glass panels or nearer than 12 inches (305 mm) from the edge of the door.

  • CRSC § 0.40 High relevance — show source text

    (c) Thermocouples. Unexposed surface temperatures shall be measured with thermocouples placed under flexible, oven-dry, felted asbestos pads of the following approximate dimensions and weight: 6 inches square (3871 mm [2] ), 0.40 inch (10 mm) in thickness, and weighing 0.026 pound. The pads shall be held firmly against the surface of the door(s) and shall fit closely about the thermocouples without breaking. The thermocouple leads shall be immersed under the pad for distance of not less than 3 [1] / 2 inches (88.9 mm), with the hot junction under the center of the pad. The thermocouple leads under the pads shall be not heavier than No. 18 B.&S. gage [0.04 inch (1 mm)] and shall be electrically insulated with heat-resistant and moisture-resistant coatings.

    (d) Recording interval. Unexposed surface temperatures shall be read at the same intervals as used for the furnace temperatures, Section 12-7-304 (b).

    TEST ASSEMBLIES

    Sec. 12-7-403.

    (a) Construction and size.

    1. The construction and size of the test fire door assembly, consisting of single doors, doors in pairs, special purpose doors (such as Dutch doors, double egress doors, etc.) or multisection doors shall be representative of that for which classification or rating is desired. The materials and construction of the door and frame, and the details of the installation, hardware, hangers, guides, trim, finish and clearance or lap shall be recorded to ensure positive identification or duplication in all respects.
    2. A floor structure shall be provided as part of the opening to be protected, except where such floor interferes with the operation of the door. The floor segment shall be of noncombustible material and shall project into the furnace approximately twice the thickness of the test door.

    2025 CALIFORNIA REFERENCED STANDARDS CODE 31

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

    FIRE-RESISTIVE STANDARDS

    (b) Mounting of doors for test purposes.

    1. Swinging doors shall be mounted so as to open into the furnace chamber, except doors in pairs swinging in opposite directions shall be mounted so as to have one door leaf open into and one door leaf open away from the furnace chamber.

    2. Sliding and rolling doors, except passenger elevator shaft doors, shall be mounted on the exposed side of the opening in the wall closing the furnace chamber.

    3. Passenger elevator shaft doors shall be mounted on the unexposed side of the opening in the wall closing the furnace chamber.

    4. Access-type door and chute-type door and frame assemblies shall be mounted so as to have one assembly open into the furnace chamber and another assembly open away from the furnace chamber. Ceiling access doors and frame assemblies shall be mounted in a representative ceiling with the room side of the access door opening into the furnace chamber.

    5. Dumbwaiter and service counter door and frame assemblies shall be mounted on the exposed side of the opening in the wall.

    6. Door frames shall be evaluated when mounted so as to have the doors open either away from or into the furnace chamber at the discretion of the enforcing agency to obtain representative information on the performance of the construction under test.

    7. Surface-mounted hardware (fire exit devices) for use on fire doors shall be evaluated by being installed on one door assembly swinging into the furnace chamber and another door assembly swinging away from the furnace chamber.

  • CRSC § 1.6 High relevance — show source text

    The floor segment shall be of noncombustible material and shall project into the furnace approximately twice the thickness of the test door.

    2025 CALIFORNIA REFERENCED STANDARDS CODE 31

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

    FIRE-RESISTIVE STANDARDS

    (b) Mounting of doors for test purposes.

    1. Swinging doors shall be mounted so as to open into the furnace chamber, except doors in pairs swinging in opposite directions shall be mounted so as to have one door leaf open into and one door leaf open away from the furnace chamber.

    2. Sliding and rolling doors, except passenger elevator shaft doors, shall be mounted on the exposed side of the opening in the wall closing the furnace chamber.

    3. Passenger elevator shaft doors shall be mounted on the unexposed side of the opening in the wall closing the furnace chamber.

    4. Access-type door and chute-type door and frame assemblies shall be mounted so as to have one assembly open into the furnace chamber and another assembly open away from the furnace chamber. Ceiling access doors and frame assemblies shall be mounted in a representative ceiling with the room side of the access door opening into the furnace chamber.

    5. Dumbwaiter and service counter door and frame assemblies shall be mounted on the exposed side of the opening in the wall.

    6. Door frames shall be evaluated when mounted so as to have the doors open either away from or into the furnace chamber at the discretion of the enforcing agency to obtain representative information on the performance of the construction under test.

    7. Surface-mounted hardware (fire exit devices) for use on fire doors shall be evaluated by being installed on one door assembly swinging into the furnace chamber and another door assembly swinging away from the furnace chamber.

    8. The mounting of all doors shall be such that they fit snugly within the frame, against the wall surfaces, or in guides, but such mounting shall not prevent free and easy operation of the test door.

    9. Clearances for swinging doors shall be [with a minus [1] / 16 -inch (1.6 mm) tolerance] as follows: [1] / 8 inch (3.2 mm) along the meeting edge of doors in pairs, [3] / 8 inch (9.5 mm) at the bottom edge of single swing doors and [1] / 4 inch (6.35 mm) at the bottom edge of a pair of doors.

    10. Clearances for horizontal sliding doors not mounted within guides [with a minus [1] / 8 -inch (3.2 mm) tolerance] shall be as follows: [1] / 2 inch (13 mm) between door and wall surfaces, [3] / 8 inch (9.5 mm) between door and floor structure and [1] / 4 inch (6.35 mm) between the meeting edges of center parting doors. A minimum lap of 4 inches (102 mm) of the door over the wall opening at sides and top shall be provided.

    11. Clearances for vertical sliding doors moving within guides [with a minus [1] / 8 -inch (3.2 mm) tolerance] shall be as follows: 1 / 2 inch (13 mm) between door and wall surfaces along the top and/or bottom door edges with guides mounted directly to the wall surface, and [3] / 16 inch (4.8 mm) between meeting edges of biparting doors or [3] / 16 inch (4.8 mm) between door and floor structure or sill.

  • CRSC § 304.8 High relevance — show source text

    or heavy timber, or fire-retardant-treated wooda, b|≥ 2 feet to < 5 feet| |Projections|Not fire-resistance rated|0 hours|≥ 5 feet| |Openings in
    walls|Not allowed|NA|< 3 feet| |Openings in
    walls|25% maximum of wall area|0 hours|3 feet| |Openings in
    walls|Unlimited|0 hours|5 feet| |Penetrations|All|Comply with Section R302.4|< 3 feet| |Penetrations|All|None required|3 feet| |For SI: 1 foot = 304.8 mm.
    NA = Not Applicable.
    a. The fire-resistance rating shall be permitted to be reduced to 0 hours on the underside of the eave overhang if fireblocking is provided from the wall top plate to the underside
    of the roof sheathing.
    b. The fire-resistance rating shall be permitted to be reduced to 0 hours on the underside of the rake overhang where vent openings that communicate with the attic are not
    installed in the overhang or gable wall.|For SI: 1 foot = 304.8 mm.
    NA = Not Applicable.
    a. The fire-resistance rating shall be permitted to be reduced to 0 hours on the underside of the eave overhang if fireblocking is provided from the wall top plate to the underside
    of the roof sheathing.
    b. The fire-resistance rating shall be permitted to be reduced to 0 hours on the underside of the rake overhang where vent openings that communicate with the attic are not
    installed in the overhang or gable wall.|For SI: 1 foot = 304.8 mm.
    NA = Not Applicable.
    a. The fire-resistance rating shall be permitted to be reduced to 0 hours on the underside of the eave overhang if fireblocking is provided from the wall top plate to the underside
    of the roof sheathing.
    b. The fire-resistance rating shall be permitted to be reduced to 0 hours on the underside of the rake overhang where vent openings that communicate with the attic are not
    installed in the overhang or gable wall.|For SI: 1 foot = 304.8 mm.
    NA = Not Applicable.
    a. The fire-resistance rating shall be permitted to be reduced to 0 hours on the underside of the eave overhang if fireblocking is provided from the wall top plate to the underside
    of the roof sheathing.
    b. The fire-resistance rating shall be permitted to be reduced to 0 hours on the underside of the rake overhang where vent openings that communicate with the attic are not
    installed in the overhang or gable wall.|

    TABLE R302.1(2)—EXTERIOR WALLS—DWELLINGS, TOWNHOUSES AND ACCESSORY BUILDINGS
    WITH AUTOMATIC RESIDENTIAL FIRE SPRINKLER PROTECTION    		 Col2 Col3 Col4
    ** EXTERIOR WALL ELEMENT** ** EXTERIOR WALL ELEMENT** ** MINIMUM FIRE-RESISTANCE RATING** ** MINIMUM FIRE**
    SEPARATION
    DISTANCE
    Walls Fire-resistance rated 1 hour—tested in accordance with ASTM E119, UL 263 or Section 703.2.
  • CRSC § 12-7 High relevance — show source text

    32 2025 CALIFORNIA REFERENCED STANDARDS CODE

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

    FIRE-RESISTIVE STANDARDS

    TABLE 12-7-4A—HOSE STREAM TEST Col2 Col3
    DESIRED RATING WATER PRESSURE AT BASE OF NOZZLE,
    POUNDS PER SQUARE INCH    		 DURATION OF APPLICATION, SECONDS
    PER SQUARE FOOT EXPOSED AREA
    3 hours 45 3
    11/2 hours and over if less than 3 hours 30 1.5
    1 hour and over if less than 11/2 hours 30 0.9
    Less than 1 hour 30 0.6

    REPORT

    Sec. 12-7-405.

    1. The report shall record the construction and mounting details of the door(s) as provided in Section 12-7-403. Drawings and photographs of construction and mounting details shall be provided.
    2. The results shall be reported in accordance with the performance in tests prescribed in these test methods. The report shall show the performance under the desired exposure period chosen from the following: 20 minutes, 30 minutes, 45 minutes, 1 hour, 1 [1] / 2 hours or 3 hours. The report shall include the temperature measurements of the furnace, and if determined, of the unexposed side of the test assembly. It shall also contain a record of all observations having a bearing on the performance of the test assembly.

    CONDITIONS OF ACCEPTANCE

    Sec. 12-7-406.

    (a) General.

    1. A door assembly shall be considered as meeting the requirements for acceptable performance when it remains in the opening during the tests specified in this standard within the limitations contained in this section for the desired endurance rating.
    2. The test assembly shall have withstood the fire endurance test and hose stream test without developing openings anywhere through the assembly, except that dislodging of small fragments from the central area of the glass light shall be disregarded. The edges of the individual glass light shall remain in place.

    Exception: The hose stream test shall not be required for opposite swing double egress exit doors, and for doors of fire endurance rating of less than 45 minutes with or without approved wired glass lights. 3. Flaming on the unexposed surface of a door assembly shall not be permitted during the first 30 minutes of the classification periods. Some intermittent light flames [tongues of flame not exceeding approximately 6 inches (152 mm) in length] for periods not exceeding 5-minute intervals are permissible along the edges of door after 30 minutes. During the last 15 minutes of the classification period the unexposed surface area of the door covered by light flaming or charring shall be contained within a distance of 1 [1] / 2 inches (38 mm) from a vertical door edge and within 3 inches (76 mm) from the top edge of the door.

    Exception: On doors not subjected to the hose stream test, finished with surface veneers or crossbands and veneers, surface flaming on the unexposed surface shall not burn or char crossbands or surface veneer along the hinge or latch jamb and shall not burn or char crossbands or surface veneer down more than [1] / 2 inch (13 mm) from the top edge, except that light browning without any flaming may occur at throughbolts and the latch rose.

  • CRSC § 716.1.2.2.2 High relevance — show source text

    716.1.2.2.2 Fire-protection-rated glazing identification. For fire-protection-rated glazing, the label shall bear the following identification required in Tables 716.1(1) and 716.1(3): “OH – XXX.” “OH” indicates that the glazing meets both the fire protection and the hose-stream requirements of NFPA 257 or UL 9 and is permitted to be used in fire window openings. The placeholder “XXX” represents the fire-rating period, in minutes.

    716.1.2.2.3 Fire-resistance-rated glazing identification. For fire-resistance-rated glazing, the label shall bear the identification required in Section 703.4 and Table 716.1(1).

    716.1.2.2.4 Fire-rated glazing that exceeds the code requirements. Fire-rated glazing assemblies marked as complying with hose stream requirements (H) shall be permitted in applications that do not require compliance with hose stream requirements. Fire-rated glazing assemblies marked as complying with temperature rise requirements (T) shall be permitted in applications that do not require compliance with temperature rise requirements. Fire-rated glazing assemblies marked with ratings (XXX) that exceed the ratings required by this code shall be permitted.

    716.1.2.3 Fire-resistance-rated glazing. Fire-resistance-rated glazing tested as part of a fire-resistance-rated wall or floor/ceiling assembly in accordance with ASTM E119 or UL 263 and labeled in accordance with Section 703.4 shall not otherwise be required to comply with this section where used as part of a wall or floor/ceiling assembly.

    716.1.2.3.1 Glazing in fire door and fire window assemblies. Fire-resistance-rated glazing shall be permitted in fire door and fire window assemblies where tested and installed in accordance with their listings and where in compliance with the requirements of this section.

    716.2 Fire door assemblies. Fire door assemblies required by other sections of this code shall comply with the provisions of this section. Fire door frames with transom lights, sidelights or both shall be permitted in accordance with Section 716.2.5.4.

    716.2.1 Testing requirements. Approved fire door and fire shutter assemblies shall be constructed of any material or assembly of component materials that conforms to the test requirements of Sections 716.2.1.1 through 716.2.1.4 and the fire protection rating indicated in Table 716.1(2).

    Exceptions:

    1. Labeled protective assemblies that conform to the requirements of this section or UL 10A, UL 14B and UL 14C for tinclad fire door assemblies.

    2. Floor fire door assemblies in accordance with Section 712.1.13.1.

    716.2.1.1 Side-hinged or pivoted swinging doors. Fire door assemblies with side-hinged and pivoted swinging doors shall be tested in accordance with NFPA 252 or UL 10C. For tests conducted in accordance with NFPA 252, the fire test shall be conducted using the positive pressure method specified in the standard.

  • CRSC § 716.1.2.3 High relevance — show source text

    Fire-resistance-rated
    glazing assemblies tested to ASTM E119 or UL 263, as specified in Section 716.1.2.3, shall be permitted.|NP = Not Permitted.
    a. Not permitted except fire-resistance-rated glazing assemblies tested to ASTM E119 or UL 263, as specified in Section 716.1.2.3.
    b. XXX = The fire rating duration period in minutes, which shall be equal to the fire-resistance rating required for the wall assembly.
    c. Fire-protection-rated glazing is not permitted for fire barriers required by Section 1207 of the_California Fire Code_ to enclose energy storage systems. Fire-resistance-rated
    glazing assemblies tested to ASTM E119 or UL 263, as specified in Section 716.1.2.3, shall be permitted.|NP = Not Permitted.
    a. Not permitted except fire-resistance-rated glazing assemblies tested to ASTM E119 or UL 263, as specified in Section 716.1.2.3.
    b. XXX = The fire rating duration period in minutes, which shall be equal to the fire-resistance rating required for the wall assembly.
    c. Fire-protection-rated glazing is not permitted for fire barriers required by Section 1207 of the_California Fire Code_ to enclose energy storage systems. Fire-resistance-rated
    glazing assemblies tested to ASTM E119 or UL 263, as specified in Section 716.1.2.3, shall be permitted.|

    2025 CALIFORNIA BUILDING CODE 7-29

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

    �

    FIRE AND SMOKE PROTECTION FEATURES

    716.1.1 Alternative methods for determining fire protection ratings. The application of any of the alternative methods specified in this section shall be based on the fire exposure and acceptance criteria specified in NFPA 252, NFPA 257, UL 9, UL 10B or UL 10C. The required fire protection rating of an opening protective shall be permitted to be established by any of the following methods or procedures:

    1. Designs documented in approved sources.
    2. Engineering analysis based on a comparison of opening protective designs having fire protection ratings as determined by the test procedures set forth in NFPA 252, NFPA 257, UL 9, UL 10B or UL 10C.
    3. Alternative protection methods as allowed by Section 104.2.3.

    716.1.2 Glazing. Glazing used in fire door assemblies and fire window assemblies shall comply with this section in addition to the requirements of Sections 716.2 and 716.3, respectively.

    716.1.2.1 Safety glazing. Fire-protection-rated glazing and fire-resistance-rated glazing installed in fire door assemblies and fire window assemblies shall comply with the safety glazing requirements of Chapter 24 where applicable.

    716.1.2.2 Marking fire-rated glazing assemblies. Fire-rated glazing assemblies shall be marked in accordance with Tables 716.1(1), 716.1(2) and 716.1(3).

  • CRSC § 6.2 High relevance — show source text

    R202, R302.11

    E283/E283M—19: Standard Test Method for Determining Rate of Air Leakage Through Exterior Windows, Skylights, Curtain Walls, and Doors Under Specified Pressure Differences Across the Specimen

    R202

    E330/E330M—14(2021): Test Method for Structural Performance of Exterior Windows, Doors, Skylights and Curtain Walls by Uniform Static Air Pressure Difference

    R609.4, R609.5, R609.6.2, R703.1.2

    E331—2000(2016): Test Method for Water Penetration of Exterior Windows, Skylights, Doors, and Curtain Walls by Uniform Static Air Pressure Difference

    R703.1.1

    E814—2013A(2017): Standard Test Method for Fire Tests of Penetration Firestop Systems

    R302.4.1.2

    E970—2017: Standard Test Method for Critical Radiant Flux of Exposed Attic Floor Insulation Using a Radiant Heat Energy Source

    R302.10.4

    E1592—2005(2017): Test Method for Structural Performance of Sheet Metal Roof and Siding Systems by Uniform Static Air Pressure Difference

    R905.10.5

    44-12 2025 CALIFORNIA RESIDENTIAL CODE

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

    REFERENCED STANDARDS

    E1602—2003(2017): Guide for Construction of Solid Fuel Burning Masonry Heaters

    R1002.2

    E1745—17: Standard Specification for Plastic Water Vapor Retarders Used in Contact with Soil or Granular Fill under Concrete Slabs

    R506.3.3

    E1886—19: Standard Test Method for Performance of Exterior Windows, Curtain Walls, Doors, and Impact Protective Systems Impacted by Missile(s) and Exposed to Cyclic Pressure Differentials R301.2.1.2, R609.6.1, R609.6.2, Table R703.11.2

    E1996—20: Specification for Performance of Exterior Windows, Curtain Walls, Doors, and Impact Protective Systems Impacted by Windborne Debris in Hurricanes

    R301.2.1.2, R609.6.1, R609.6.2

    E2178—21a: Standard Test Method for Determining Air Leakage Rate and Calculation of Air Permeance of Building Materials

    R202

    E2273—2018: Standard Test Method for Determining the Drainage Efficiency of Exterior Insulation and Finish Systems (EIFS) Clad Wall Assemblies

    R703.9.2

    E2556/E2556M—2010(2016): Standard Specification for Vapor Permeable Flexible Sheet Water-resistive Barriers Intended for Mechanical Attachment

    R703.2

    E2568—2017A: Standard Specification for PB Exterior Insulation and Finish Systems

    R703.9.1, R703.9.2

    E2570/E2570M—07(2019): Standard Test Methods for Evaluating Water-Resistive Barrier (WRB) Coatings Used under Exterior Insulation and Finish Systems (EIFS) or EIFS with Drainage

    R703.9.2

    E2632/E2632M—2013e1: Standard Test Method for Evaluating the Under-Deck Fire Test Response of Deck Materials:

  • CRSC § 12-7 High relevance — show source text

    CHAPTER 12-7-1 FIRE-RESISTIVE STANDARDS. . . . . . . . . . 13

    CHAPTER 12-7-2 FIRE-RESISTIVE STANDARDS

    RESERVED . . . . . . . . . . . . . . . . . . . . . . . . . 23

    CHAPTER 12-7-3 FIRE-RESISTIVE STANDARDS. . . . . . . . . . 25

    CHAPTER 12-7-4 FIRE-RESISTIVE STANDARDS. . . . . . . . . . 31

    CHAPTER 12-7-5 FIRE-RESISTIVE STANDARDS. . . . . . . . . . 35

    CHAPTER 12-7A MATERIALS AND CONSTRUCTION

    METHODS FOR EXTERIOR WILDFIRE

    EXPOSURE . . . . . . . . . . . . . . . . . . . . . . . . . 37

    CHAPTER 12-8-1 FIRE-RESISTIVE STANDARDS FOR

    FIRE PROTECTION . . . . . . . . . . . . . . . . . . 51

    APPENDIX 12-8-1A CALCULATION OF THE TOTAL RATE

    OF HEAT AND CARBON MONOXIDE OR

    CARBON DIOXIDE PRODUCTION . . . . . . . 63

    APPENDIX 12-8-1B GUIDE TO MOUNTING TECHNIQUES FOR

    WALL AND CEILING INTERIOR FINISH

    MATERIAL. . . . . . . . . . . . . . . . . . . . . . . . . . 67

    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

  • CRSC § 12-7 High relevance — show source text

    CONDUCT OF TESTS

    Sec. 12-7-404.

    (a) Time of testing. Masonry settings shall be allowed to dry at least 3 days before tests are made.

    (b) Fire endurance test.

    1. The pressure in the furnace chamber shall be maintained as nearly equal to the atmospheric pressure as possible.
    2. The test shall be continued until the exposure period of the desired classification or rating is reached, unless the conditions of acceptance set forth in the appropriate paragraphs are exceeded in a shorter period.

    (c) Hose stream test.

    1. Immediately following the fire endurance test, the test assembly shall be subjected to the impact, erosion and cooling effects of a hose stream directed first at the middle and then at all parts of the exposed surface, changes in direction being made slowly.
    2. The hose stream shall be delivered through a 2 [1] / 2 -inch (63.5 mm) hose discharging through a national standard play-pipe of corresponding size equipped with a 1 [1] / 8 -inch (22 mm) discharge tip of the standard-taper smooth-bore pattern without shoulder at the orifice. The water pressure at the base of the nozzle and duration of the application in seconds per square feet of exposed area shall be as given in Table 12-7-4A.
    3. The tip of the nozzle shall be located 20 feet (6096 mm) from and on a line normal to the center of the test door. If impossible to be so located, the nozzle may be on a line deviating not more than 30 degrees from the line normal to the center of the test door. When so located the distance from the center shall be less than 20 feet (6096 mm) by an amount equal to 1 foot (305 mm) for each 10 degrees of deviation from the normal.

    32 2025 CALIFORNIA REFERENCED STANDARDS CODE

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

    FIRE-RESISTIVE STANDARDS

    TABLE 12-7-4A—HOSE STREAM TEST Col2 Col3
    DESIRED RATING WATER PRESSURE AT BASE OF NOZZLE,
    POUNDS PER SQUARE INCH    		 DURATION OF APPLICATION, SECONDS
    PER SQUARE FOOT EXPOSED AREA
    3 hours 45 3
    11/2 hours and over if less than 3 hours 30 1.5
    1 hour and over if less than 11/2 hours 30 0.9
    Less than 1 hour 30 0.6

    REPORT

    Sec. 12-7-405.

    1. The report shall record the construction and mounting details of the door(s) as provided in Section 12-7-403. Drawings and photographs of construction and mounting details shall be provided.
    2. The results shall be reported in accordance with the performance in tests prescribed in these test methods. The report shall show the performance under the desired exposure period chosen from the following: 20 minutes, 30 minutes, 45 minutes, 1 hour, 1 [1] / 2 hours or 3 hours. The report shall include the temperature measurements of the furnace, and if determined, of the unexposed side of the test assembly. It shall also contain a record of all observations having a bearing on the performance of the test assembly.

    CONDITIONS OF ACCEPTANCE

    Sec. 12-7-406.

  • CRSC § 304.8 High relevance — show source text

    The fire-resistance rating shall be permitted to be reduced to 0 hours on the underside of the eave overhang if fireblocking is provided from the wall top plate to the underside
    of the roof sheathing.
    b. The fire-resistance rating shall be permitted to be reduced to 0 hours on the underside of the rake overhang where vent openings that communicate with the attic are not
    installed in the overhang or gable wall.|For SI: 1 foot = 304.8 mm.
    NA = Not Applicable.
    a. The fire-resistance rating shall be permitted to be reduced to 0 hours on the underside of the eave overhang if fireblocking is provided from the wall top plate to the underside
    of the roof sheathing.
    b. The fire-resistance rating shall be permitted to be reduced to 0 hours on the underside of the rake overhang where vent openings that communicate with the attic are not
    installed in the overhang or gable wall.|

    TABLE R302.1(2)—EXTERIOR WALLS—DWELLINGS, TOWNHOUSES AND ACCESSORY BUILDINGS
    WITH AUTOMATIC RESIDENTIAL FIRE SPRINKLER PROTECTION    		 Col2 Col3 Col4
    ** EXTERIOR WALL ELEMENT** ** EXTERIOR WALL ELEMENT** ** MINIMUM FIRE-RESISTANCE RATING** ** MINIMUM FIRE**
    SEPARATION
    DISTANCE
    Walls Fire-resistance rated 1 hour—tested in accordance with ASTM E119, UL 263 or Section 703.2.2 of
    the_California Building Code_ with exposure from the outside    		 0 feet
    Walls Not fire-resistance rated 0 hours 3 feeta
    Projections Not allowed NA < 2 feet
    Projections Fire-resistance rated 1 hour on the underside, or heavy timber, or fire-retardant-treated woodb, c 2 feeta
    Projections Not fire-resistance rated 0 hours 3 feet
    Openings in
    walls    		 Not allowed NA < 3 feet
    Openings in
    walls    		 Unlimited 0 hours 3 feeta
    Penetrations All Comply with Section R302.4 < 3 feet
    Penetrations All None required 3 feeta
    For SI: 1 foot = 304.8 mm.
    NA = Not Applicable.
    a. For residential subdivisions where all dwellings and townhouses are equipped throughout with an automatic sprinkler system installed in accordance with Section_R309_, the fire
    separation distance for exterior walls not fire-resistance rated and for fire-resistance-rated projections shall be permitted to be reduced to 0 feet, and unlimited unprotected
    openings and penetrations shall be permitted, where the adjoining lot provides an open setback yard that is 6 feet or more in width on the opposite side of the property line.
    b. The fire-resistance rating shall be permitted to be reduced to 0 hours on the underside of the eave overhang if fireblocking is provided from the wall top plate to the underside
    of the roof sheathing.
    c. The fire-resistance rating shall be permitted to be reduced to 0 hours on the underside of the rake overhang where vent openings that communicate with the attic are not
    installed in the overhang or gable wall.    		 For SI: 1 foot = 304.8 mm.
    NA = Not Applicable.
    a.

Frequently asked questions

What section gives the hose‑stream pressures and durations?

Table 12‑7‑4A, implemented in § 12-7-404(c), prescribes water pressures and seconds per square foot durations for the hose‑stream test.

Where are furnace size and type requirements located?

Furnace design, size and opening dimensions are in § 12-7-301 (part of Chapter 12‑7‑3).

Do the tests certify a door for reuse after a fire?

No. § 12-7-400(b) states tests “register performance” during exposure but do not determine suitability for use after exposure.

If my door has a glass light, does that change temperature classification?

Labels must show temperature rise classification; glass lights ≤ 100 in² carry same temperature rating as the door; larger lights are rated as having surface temperature in excess of 650°F at 30 minutes — see § 12-7-407(b)(6) / related marking rules.

Are half‑scale furnaces ever allowed for door testing?

Yes — § 12-7-401(b) permits half‑scale vertical wall furnaces for doors not exceeding 4 ft × 7 ft‑2 in in some evaluations (especially hardware).

More in California Referenced Standards Code

Ask about the CRSC

Get cited, plain-English answers on the California Referenced Standards Code for your project — any code section, any scenario.

Start Free Trial

Related in the CRSC

What CRSC standard governs releasing systems for security bars in dwellings?

What are the CRSC test, design and installation requirements for emergency exit and panic hardware?

Fire & Egress Referenced Standards (SFM)

California Referenced Standards Code