Material‑specific chapters (compressed gases, aerosols, toxic and reactive materials)

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

• CFC § 1.11. High relevance — show source text

  • The California Code of Regulations (CCR), Title 19, Division 1 provisions that are found in the California Fire Code are a reprint from the current CCR, Title 19, Division 1 text for the code user’s convenience only. The scope, applicability and appeals procedures of CCR, Title 19, Division I remain the same. The state agency does not adopt sections identified by 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.

  2025 CALIFORNIA FIRE CODE 66-1

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

  66-2 2025 CALIFORNIA FIRE CODE

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

  66 UNSTABLE (REACTIVE) MATERIALS

  User notes:

  About this chapter: Chapter 66 addresses the hazards of unstable (reactive) liquid and solid materials as well as unstable (reactive) compressed gases. In addition to their unstable reactivity, these materials may pose other hazards, such as toxicity, corrosivity, explosivity, flammability or oxidizing potential. This chapter, however, is intended to address those materials whose primary hazard is unstable reactivity. Materials that pose multiple hazards must conform to the requirements of the code with respect to all hazards. Strict compliance with the provisions of this chapter, along with proper housekeeping and storage arrangements, helps to reduce the exposure hazards associated with unstable (reactive) materials in a fire or other

  emergency.

  SECTION 6601—GENERAL

  6601.1 Scope. The storage and use of unstable (reactive) materials shall be in accordance with this chapter. Compressed gases shall also comply with Chapter 53.

  Exceptions:

  1. Display and storage in Group M and storage in Group S occupancies complying with Section 5003.11.
  2. Detonable unstable (reactive) materials shall be stored in accordance with Chapter 56.

  6601.2 Permits. Permits shall be required as set forth in Section 105.5.

  SECTION 6602—DEFINITION

  6602.1 Definition. The following term is defined in Chapter 2:

  UNSTABLE (REACTIVE) MATERIAL.

  Class 4.

  Class 3.

  Class 2.

  Class 1.

  SECTION 6603—GENERAL REQUIREMENTS

  6603.1 Quantities not exceeding the maximum allowable quantity per control area. Quantities of unstable (reactive) materials not exceeding the maximum allowable quantity per control area shall be in accordance with Sections 6603.1.1 through 6603.1.2.5.

  6603.1.1 General. The storage and use of unstable (reactive) materials in amounts not exceeding the maximum allowable quantity per control area indicated in Section 5003.1 shall be in accordance with Sections 5001, 5003, 6601 and 6603.

  6603.1.2 Limitations for indoor storage and use by occupancy. The indoor storage of unstable (reactive) materials shall be in accordance with Sections 6603.1.2.1 through 6603.1.2.5.

• CFC § 1.9 Medium relevance — show source text

  E102.1.9 Pyrophoric materials. Examples include:

  1. Gases: diborane, phosphine, silane.
  2. Liquids: diethylaluminum chloride, di-ethylberyllium, diethylphosphine, diethylzinc, dimethylarsine, triethylaluminum etherate, tri-ethylbismuthine, triethylboron, trimethylaluminum, trimethylgallium.
  3. Solids: cesium, hafnium, lithium, white or yellow phosphorous, plutonium, potassium, rubidium, sodium, thorium.

  E102.1.10 Unstable (reactive) materials. Examples include:

  Class 4: acetyl peroxide, dibutyl peroxide, dinitrobenzene, ethyl nitrate, peroxyacetic acid and picric acid (dry) trinitrobenzene.

  Class 3: hydrogen peroxide (greater than 52 percent), hydroxylamine, nitromethane, paranitroaniline, perchloric acid and tetrafluoroethylene monomer.

  Class 2: acrolein, acrylic acid, hydrazine, methacrylic acid, sodium perchlorate, styrene and vinyl acetate.

  Class 1: acetic acid, hydrogen peroxide 35 percent to 52 percent, paraldehyde and tetrahydrofuran.

  E102.1.11 Water-reactive materials. Examples include:

  Class 3: aluminum alkyls such as triethylaluminum, isobutylaluminum and trimethylaluminum; bromine pentafluoride, bromine trifluoride, chlorodiethylaluminium and diethylzinc.

  Class 2: calcium carbide, calcium metal, cyanogen bromide, lithium hydride, methyldichlorosilane, potassium metal, potassium peroxide, sodium metal, sodium peroxide, sulfuric acid and trichlorosilane.

  Class 1: acetic anhydride, sodium hydroxide, sulfur monochloride and titanium tetrachloride.

  E102.1.12 Cryogenic fluids. The cryogenics listed will exist as compressed gases where they are stored at ambient temperatures.

  1. Flammable: carbon monoxide, deuterium (heavy hydrogen), ethylene, hydrogen, methane.
  2. Oxidizing: fluorine, nitric oxide, oxygen.
  3. Corrosive: fluorine, nitric oxide.
  4. Inert (chemically unreactive): argon, helium, krypton, neon, nitrogen, xenon.
  5. Highly toxic: fluorine, nitric oxide.

  E102.2 Health hazards. Materials classified in this section pose a health hazard.

  E102.2.1 Highly toxic materials. Examples include:

  1. Gases: arsine, cyanogen, diborane, fluorine, germane, hydrogen cyanide, nitric oxide, nitrogen dioxide, ozone, phosphine, hydrogen selenide, stibine.
  2. Liquids: acrolein, acrylic acid, 2-chloroethanol (ethylene chlorohydrin), hydrazine, hydrocyanic acid, 2-methylaziridine (propylenimine), 2-methyl-acetonitrile (acetone cyanohydrin), methyl ester isocyanic acid (methyl isocyanate), nicotine, tetranitromethane and tetraethylstannane (tetraethyltin).
• CFC § 5301.1 Medium relevance — show source text

  SECTION 5301—GENERAL

  5301.1 Scope. Storage, use and handling of compressed gases in compressed gas containers, cylinders, tanks and systems shall comply with this chapter and NFPA 55, including those gases regulated elsewhere in this code. Partially full compressed gas containers, cylinders or tanks containing residual gases shall be considered as full for the purposes of the controls required.

  Liquefied natural gas for use as a vehicular fuel shall also comply with NFPA 52 and NFPA 59A.

  Compressed gases classified as hazardous materials shall also comply with Chapter 50 for general requirements and chapters addressing specific hazards, including Chapters 58 (Flammable Gases and Flammable Cryogenic Fluids), 60 (Highly Toxic and Toxic Materials), 63 (Oxidizers, Oxidizing Gases and Oxidizing Cryogenic Fluids) and 64 (Pyrophoric Materials).

  Compressed hydrogen (CH 2 ) shall also comply with the applicable portions of Chapters 23 and 58 of this code, the International Fuel Gas Code and NFPA 2.

  Cutting and welding gases shall also comply with Chapter 35.

  Exceptions:

  1. Gases used as refrigerants in refrigeration systems (see Section 608).

  2. Compressed natural gas (CNG) for use as a vehicular fuel shall comply with Chapter 23, the International Fuel Gas Code and NFPA 52.

  3. Cryogenic fluids shall comply with Chapter 55.

  4. LP-gas shall comply with Chapter 61 and the International Fuel Gas Code .

  [California Code of Regulations, Title 19, Division 1, §3.18(a) and (b)] Hazardous Areas.

  (a) General. Occupancies or portions thereof used or intended to be used as operating rooms, surgeries, delivery rooms, storage rooms and similar hazardous locations in which flammable or nonflammable mixtures of gases are used or stored shall be main- tained in accordance with the provisions of NFPA 99-2005 Inhalation Anesthetics, NFPA 99-2005 Laboratories, NFPA 99-2005 Hyperbaric Facilities, NFPA 55-2010 Bulk Oxygen Systems at Consumer Sites, and this section.

  (b) Containers. Cylinders and fittings for compressed gases shall conform to the regulations of the Federal Department of Transportation.

  Compressed gas cylinders shall be clearly marked with the name of the gas contained therein. Cylinders shall bear color makings and labels conforming to the following:

  Gas Color

  (1) Oxygen..................................................................Green

  (2) Carbon Dioxide....................................................... Gray

  (3) Nitrous Oxide.................................................Light Blue

  (4) Cyclopropan...................................................... Orange

  (5) Helium .................................................................Brown

  (6) Ethlene......................................................................Red

  (7) Carbon Dioxide and Oxygen................Gray and Green

  (8) Helium and Oxygen ..........................Brown and Green

  Note: Polished metal or chrome-plated cylinders shall have color tags in addition to color labels.

  When deemed necessary by the enforcing agency, compressed gas cylinders shall be secured by chains, metal straps or other approved materials to prevent overturning.

  5301.2 Permits. Permits shall be required as set forth in Section 105.5.

  2025 CALIFORNIA FIRE CODE 53-3

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

  COMPRESSED GASES

• CFC § 3.18 Medium relevance — show source text

  (Matrix Adoption Tables are nonregulatory, intended only as an aid to the code user. See Chapter 1 for state agency authority and building applications.)

  Adopting Agency	BSC	BSC- CG	SFM	Col5	HCD	Col7	Col8	DSA	Col10	OSHPD	Col12	Col13	Col14	Col15	Col16	BSCC	DPH	AGR	DWR	CEC	CA	SL	SLC
  Adopting Agency	BSC	BSC- CG	T-24	T-19*	1	2	1/AC	AC	SS	1	1R	2	3	4	5	5	5	5	5	5	5	5	5
  Adopt Entire Chapter			X
  Adopt Entire Chapter as amended (amended sections listed below)
  Adopt only those sections that are listed below
  [California Code of Regulations, Title 19, Division 1]				X
  Chapter / Section
  [T-19 §3.18 (a)(b)]				X

  • The California Code of Regulations (CCR), Title 19, Division 1 provisions that are found in the California Fire Code are a reprint from the current CCR, Title 19, Division 1 text for the code user’s convenience only. The scope, applicability and appeals procedures of CCR, Title 19, Division I remain the same. The state agency does not adopt sections identified by 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.

  2025 CALIFORNIA FIRE CODE 53-1

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

  53-2 2025 CALIFORNIA FIRE CODE

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

  53 COMPRESSED GASES

  User notes:

  About this chapter: Chapter 53 regulates the storage, use and handling of all flammable and nonflammable compressed gases, such as those that are used in medical facilities, air separation plants, industrial plants, agricultural equipment and similar occupancies. Also, this chapter regulates inert gases, such as CO 2 used for enrichment and beverage dispensing, that although inert are considered asphyxiants and in larger amounts pose a life safety hazard. Standards for the design, construction and marking of compressed gas cylinders and pressure vessels are referenced. Compressed gases used in welding and cutting, cryogenic liquids and liquefied petroleum gases are also regulated under Chapters 35, 55 and 61, respectively. Compressed gases that are classified as hazardous materials are also regulated in Chapter 50, which includes general requirements.

  SECTION 5301—GENERAL

• CFC § 5305.3 Medium relevance — show source text

  5305.3 Piping systems. Piping, including tubing, valves, fittings and pressure regulators, shall comply with this section and Chapter 50. Piping, tubing, pressure regulators, valves and other apparatus shall be kept gas tight to prevent leakage.

  5305.4 Valves. Valves utilized on compressed gas systems shall be suitable for the use intended. Access to such valves shall be provided and maintained. Valve handles or operators for required shutoff valves shall not be removed or otherwise altered to prevent access.

  5305.5 Venting. Venting of gases shall be directed to an approved location. Venting shall comply with the California Mechanical Code .

  5305.6 Upright use. Compressed gas containers, cylinders and tanks, except those designed for use in a horizontal position, and all compressed gas containers, cylinders and tanks containing nonliquefied gases, shall be used in an upright position with the valve end up. An upright position shall include conditions where the container, cylinder or tank axis is inclined as much as 45 degrees (0.80 rad) from the vertical. Use of nonflammable liquefied gases in the inverted position where the liquid phase is used shall not be

  2025 CALIFORNIA FIRE CODE 53-7

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

  COMPRESSED GASES

  prohibited provided that the container, cylinder or tank is properly secured and the dispensing apparatus is designed for liquefied

  gas use.

  Exception: Compressed gas containers, cylinders and tanks with a water volume less than 1.3 gallons (5 L) are allowed to be used in a horizontal position.

  5305.7 Transfer. Transfer of gases between containers, cylinders and tanks shall be performed by qualified personnel using equipment and operating procedures in accordance with CGA P-1.

  Exception: The fueling of vehicles with CNG or CH 2, conducted in accordance with Chapter 23.

  5305.8 Use of compressed gas for inflation. Inflatable equipment, devices or balloons shall only be pressurized or filled with compressed air or inert gases.

  5305.9 Material-specific regulations. In addition to the requirements of this section, indoor and outdoor use of compressed gases shall comply with the material-specific provisions of Chapters 54, 58 and 60 through 67.

  5305.10 Handling. The handling of compressed gas containers, cylinders and tanks shall comply with Sections 5305.10.1 and 5305.10.2.

  5305.10.1 Carts and trucks. Containers, cylinders and tanks shall be moved using an approved method. Where containers, cylinders or tanks are moved by hand cart, hand truck or other mobile device, such carts, trucks or devices shall be designed for the secure movement of containers, cylinders or tanks. Carts and trucks utilized for transport of compressed gas containers, cylinders and tanks within buildings shall comply with Section 5003.10. Carts and trucks utilized for transport of compressed gas containers, cylinders and tanks exterior to buildings shall be designed so that the containers, cylinders and tanks will be secured against dropping or otherwise striking against each other or other surfaces.

  5305.10.2 Lifting devices. Ropes, chains or slings shall not be used to suspend compressed gas containers, cylinders and tanks unless provisions at time of manufacture have been made on the container, cylinder or tank for appropriate lifting attachments, such as lugs.

  SECTION 5306—MEDICAL GASES

• CFC § 101.3 Medium relevance — show source text

  3 kPa.
  H220, Category 1A, Category B; Extremely flammable
  gas; May react explosively even in the absence of air at
  elevated pressure and/or temperature. Flammable
  gases which are chemically unstable at a temperature
  greater than 20°C and/or a standard pressure greater
  than 101.3 kPa.
  H280, compressed gas, would also apply.|

  2025 CALIFORNIA FIRE CODE APPENDIX E-19

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

  APPENDIX E—HAZARD CATEGORIES

  TABLE E104.2—CFC AND GHS HAZARD DEFINITIONS COMPARISONa—continued	Col2	Col3	Col4
  **CFC ** MATERIAL	**CFC ** CLASS	CFC DEFINITION	GHS 2017 (REV 7) CLASSIFICATION (H-CODE AND CATEGORY); HAZARD STATEMENT; DEFINITION
  Water reactive	3	Materials that react explosively with water without requiring heat or confinement.	H260, Category 1; Contact with water releases flamma- ble gases which may ignite spontaneously. Any substance or mixture which reacts vigorously with water at ambient temperatures and demonstrates generally a tendency for the gas produced to ignite spontaneously, or which reacts readily with water at ambient temperatures such that the rate of evolution of flammable gas is equal to or greater than 10 liters per kilogram of substance over any 1 minute. (UN/DOT test methods: Test N.5, Part III, subsection 33.4.1.4)
  Water reactive	2	Materials that react violently with water or have the ability to boil water. Materials that produce flammable, toxic or other hazardous gases, or evolve enough heat to cause autoignition of combustibles upon exposure to water or moisture.	H261, Category 2; Contact with water releases flamma- ble gas. Any substance or mixture which reacts readily with water at ambient temperatures such that the maximum rate of evolution of flammable gas is equal to or greater than 20 liters per kilogram of substance per hour, and which does not meet the criteria for Category 1.
  Water reactive	1	Materials that react with water with some release of energy, but not violently.	H261, Category 3; Contact with water releases flamma- ble gas. Any substance or mixture which reacts slowly with water at ambient temperatures such that the maximum rate of evolution of flammable gas is equal to or greater than 1 liter per kilogram of substance per hour, and which does not meet the criteria for Catego- ries 1 and 2.
  a. The table illustrates that there is not perfect alignment between the_CFC_ and GHS definitions and provides information on similarities and difference between the two classi- fication systems.	a. The table illustrates that there is not perfect alignment between the_CFC_ and GHS definitions and provides information on similarities and difference between the two classi- fication systems.	a.

• California Fire Code Medium relevance — show source text

  Aerosol products shall be
  classified by means of the calculation of their chemical
  heats of combustion and shall be designated Level 1,
  Level 2 or Level 3.|Any nonrefillable receptacles made of metal, glass or
  plastics and containing a gas compressed, liquefied or
  dissolved under pressure, with or without a liquid,
  paste or powder, and fitted with a release device allow-
  ing the contents to be ejected as solid or liquid
  particles in suspension in a gas, as a foam, paste or
  powder or in a liquid state or in a gaseous state.| |Aerosol|Aerosol|Level 1|Those with a total chemical heat of combustion that is
  less than or equal to 8,600 Btu/lb (20 kJ/g).|H223, Category 3; Pressurized container: May burst if
  heated.
  1.
  Any aerosol that contains ≤ 1% flammable
  components (by mass) and that has a heat of
  combustion < 20 kJ/g.
  2.
  Any aerosol that contains > 1% (by mass)
  flammable components or which has a heat of
  combustion of ≥ 20 kJ/g but which, based on
  the results of the ignition distance test, the
  enclosed space ignition test or the aerosol
  foam flammability test, does not meet the
  criteria for Category 1 or Category 2.| |Aerosol|Aerosol|Level 2|Those with a total chemical heat of combustion that is
  less than or equal to 8,600 Btu/lb (20 kJ/g).|H223, Category 2; Flammable aerosol. Pressurized
  container: May burst if heated:
  1.
  Any aerosol that dispenses a spray that, based
  on the results of the ignition distance test, does
  not meet the criteria for Category 1, and which
  has:
  a.
  A heat of combustion of ≥ 20 kJ/g.
  b.
  A heat of combustion of < 20 kJ/g along
  with an ignition distance of ≥ 15 cm; or
  c.
  A heat of combustion of < 20 kJ/g and an
  ignition distance of < 15 cm along with
  either, in the enclosed space ignition test
  a time:
  i. A time equivalent of ≤ 300 s/m3; or
  ii. A deflagration density of ≤ 300
  g/m3; or
  2.
  Any aerosol that dispenses a foam that, based
  on the results of the aerosol foam flammability
  test, does not meet the criteria for Category 1,
  and which has a flame height of ≥ 4 cm and a
  flame duration of ≥ 2 s.| |Aerosol|Aerosol|Level 3|Those with a total chemical heat of combustion that is
  greater than 13,000 Btu/lb (30 kJ/g).|H222, Category 1; Extremely flammable aerosol.

• CFC § 5303.16.14 Medium relevance — show source text

  5303.16.14 Classified area. The interior of a vault containing a flammable gas shall be designated a Class I, Division 1, location, as defined in the California Electrical Code.

  SECTION 5304—STORAGE OF COMPRESSED GASES

  5304.1 Upright storage. Compressed gas containers, cylinders and tanks, except those designed for use in a horizontal position, and all compressed gas containers, cylinders and tanks containing nonliquefied gases, shall be stored in an upright position with the valve end up. An upright position shall include conditions where the container, cylinder or tank axis is inclined as much as 45 degrees (0.80 rad) from the vertical.

  Exceptions:

  1. Compressed gas containers with a water volume less than 1.3 gallons (5 L) are allowed to be stored in a horizontal position.
  2. Cylinders, containers and tanks containing nonflammable gases, or cylinders, containers and tanks containing nonliquefied flammable gases that have been secured to a pallet for transportation purposes.

  5304.2 Material-specific regulations. In addition to the requirements of this section, indoor and outdoor storage of compressed gases shall comply with the material-specific provisions of Chapters 54, 58 and 60 through 67.

  SECTION 5305—USE AND HANDLING OF COMPRESSED GASES

  5305.1 Compressed gas systems. Compressed gas systems shall be suitable for the use intended and shall be designed by persons competent in such design. Compressed gas equipment, machinery and processes shall be listed or approved.

  5305.2 Controls. Compressed gas system controls shall be designed to prevent materials from entering or leaving process or reaction systems at other than the intended time, rate or path. Automatic controls shall be designed to be fail-safe.

  5305.3 Piping systems. Piping, including tubing, valves, fittings and pressure regulators, shall comply with this section and Chapter 50. Piping, tubing, pressure regulators, valves and other apparatus shall be kept gas tight to prevent leakage.

  5305.4 Valves. Valves utilized on compressed gas systems shall be suitable for the use intended. Access to such valves shall be provided and maintained. Valve handles or operators for required shutoff valves shall not be removed or otherwise altered to prevent access.

  5305.5 Venting. Venting of gases shall be directed to an approved location. Venting shall comply with the California Mechanical Code .

  5305.6 Upright use. Compressed gas containers, cylinders and tanks, except those designed for use in a horizontal position, and all compressed gas containers, cylinders and tanks containing nonliquefied gases, shall be used in an upright position with the valve end up. An upright position shall include conditions where the container, cylinder or tank axis is inclined as much as 45 degrees (0.80 rad) from the vertical. Use of nonflammable liquefied gases in the inverted position where the liquid phase is used shall not be

  2025 CALIFORNIA FIRE CODE 53-7

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

  COMPRESSED GASES

  prohibited provided that the container, cylinder or tank is properly secured and the dispensing apparatus is designed for liquefied

  gas use.

  Exception: Compressed gas containers, cylinders and tanks with a water volume less than 1.3 gallons (5 L) are allowed to be used in a horizontal position.

• CFC § 6004.3 Medium relevance — show source text

  6004.3 Outdoor storage and use. The outdoor storage and use of highly toxic and toxic compressed gases shall be in accordance with Sections 6004.3.1 through 6004.3.4.

  6004.3.1 Applicability. The applicability of regulations governing the outdoor storage and use of highly toxic and toxic compressed gases shall be as set forth in Sections 6004.3.1.1 through 6004.3.1.3.

  2025 CALIFORNIA FIRE CODE 60-7

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

  HIGHLY TOXIC AND TOXIC MATERIALS

  6004.3.1.1 Quantities not exceeding the maximum allowable quantity per control area. The outdoor storage or use of highly toxic and toxic gases in amounts not exceeding the maximum allowable quantity per control area set forth in Table 5003.1.1(4) shall be in accordance with Sections 5001, 5003 and 6001.

  6004.3.1.2 Quantities exceeding the maximum allowable quantity per control area. The outdoor storage or use of highly toxic and toxic gases in amounts exceeding the maximum allowable quantity per control area set forth in Table 5003.1.1(4) shall be in accordance with Sections 6001 and 6004.3 and Chapter 50.

  6004.3.1.3 Ozone-gas generators. The outdoor use of ozone-gas-generating equipment shall be in accordance with Section 6005.

  6004.3.2 General outdoor requirements. The general requirements applicable to the outdoor storage and use of highly toxic and toxic compressed gases shall be in accordance with Sections 6004.3.2.1 through 6004.3.2.4.

  6004.3.2.1 Location. Outdoor storage or use of highly toxic or toxic compressed gases shall be located in accordance with Sections 6004.3.2.1.1 through 6004.3.2.1.3.

  Exception: Compressed gases located in gas cabinets complying with Sections 5003.8.6 and 6004.1.2 and located 5 feet (1524 mm) or more from buildings and 25 feet (7620 mm) or more from an exit discharge.

  6004.3.2.1.1 Distance limitation to exposures. Outdoor storage or use of highly toxic or toxic compressed gases shall not be located within 75 feet (22 860 mm) of a lot line, public street, public alley, public way, exit discharge or building not associated with the manufacture or distribution of such gases, unless all of the following conditions are met:

  1. Storage is shielded by a 2-hour fire barrier that interrupts the line of sight between the storage and the exposure.
  2. The 2-hour fire barrier shall be located not less than 5 feet (1524 mm) from any exposure.
  3. The 2-hour fire barrier shall not have more than two sides at approximately 90-degree (1.57 rad) directions, or three sides with connecting angles of approximately 135 degrees (2.36 rad).
• CFC § 6004.1.1.3 Medium relevance — show source text

  6004.1.1.3 Offices, retail sales and classrooms. Toxic and highly toxic compressed gases shall not be stored or used in offices, retail sales or classroom portions of Group B, F, M or S occupancies. Exception: In classrooms of Group B occupancies, cylinders with a capacity not exceeding 20 cubic feet (0.566 m [3] ) at NTP are allowed in gas cabinets or fume hoods.

  6004.1.2 Gas cabinets. Gas cabinets containing highly toxic or toxic compressed gases shall comply with Section 5003.8.6 and the following requirements:

  60-4 2025 CALIFORNIA FIRE CODE

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

  HIGHLY TOXIC AND TOXIC MATERIALS

  1. The average ventilation velocity at the face of gas cabinet access ports or windows shall be not less than 200 feet per minute (1.02 m/s) with not less than 150 feet per minute (0.76 m/s) at any point of the access port or window.
  2. Gas cabinets shall be connected to an exhaust system.
  3. Gas cabinets shall not be used as the sole means of exhaust for any room or area.
  4. The maximum number of cylinders located in a single gas cabinet shall not exceed three, except that cabinets containing cylinders not exceeding 1 pound (0.454 kg) net contents are allowed to contain up to 100 cylinders.
  5. Gas cabinets required by Section 6004.2 or 6004.3 shall be equipped with an approved automatic sprinkler system in accordance with Section 903.3.1.1. Alternative fire-extinguishing systems shall not be used.

  6004.1.3 Exhausted enclosures. Exhausted enclosures containing highly toxic or toxic compressed gases shall comply with Section 5003.8.5 and the following requirements:

  1. The average ventilation velocity at the face of the enclosure shall be not less than 200 feet per minute (1.02 m/s) with not less than 150 feet per minute (0.76 m/s).
  2. Exhausted enclosures shall be connected to an exhaust system.
  3. Exhausted enclosures shall not be used as the sole means of exhaust for any room or area.
  4. Exhausted enclosures required by Section 6004.2 or 6004.3 shall be equipped with an approved automatic sprinkler system in accordance with Section 903.3.1.1. Alternative fire-extinguishing systems shall not be used.

  6004.2 Indoor storage and use. The indoor storage and use of highly toxic or toxic compressed gases shall be in accordance with Sections 6004.2.1 through 6004.2.2.10.3.

  6004.2.1 Applicability. The applicability of regulations governing the indoor storage and use of highly toxic and toxic compressed gases shall be as set forth in Sections 6004.2.1.1 through 6004.2.1.3.

  6004.2.1.1 Quantities not exceeding the maximum allowable quantity per control area. The indoor storage or use of highly toxic and toxic gases in amounts not exceeding the maximum allowable quantity per control area set forth in Table 5003.1.1(2) shall be in accordance with Sections 5001, 5003, 6001 and 6004.1.

• CFC § 6003.2.5 Medium relevance — show source text

  6003.2.5 Weather protection for highly toxic liquids and solids—outdoor storage or use. Where overhead weather protection is provided for outdoor storage or use of highly toxic liquids or solids, and the weather protection is attached to a building, the storage or use area shall either be equipped throughout with an approved automatic sprinkler system in accordance with Section 903.3.1.1, or storage or use vessels shall be fire resistive. Weather protection shall be provided in accordance with Section 5004.13 for storage and Section 5005.3.9 for use.

  6003.2.6 Outdoor liquid transfer. Highly toxic and toxic liquids shall be transferred in accordance with Section 5005.1.10.

  SECTION 6004—HIGHLY TOXIC AND TOXIC COMPRESSED GASES

  6004.1 General. The storage and use of highly toxic and toxic compressed gases shall comply with this section.

  6004.1.1 Special limitations for indoor storage and use by occupancy. The indoor storage and use of highly toxic and toxic compressed gases in certain occupancies shall be subject to the limitations contained in Sections 6004.1.1.1 through 6004.1.1.3.

  6004.1.1.1 Group A, E, I or U occupancies. Toxic and highly toxic compressed gases shall not be stored or used within Group A, E, I or U occupancies. Exception: Cylinders not exceeding 20 cubic feet (0.566 m [3] ) at normal temperature and pressure (NTP) are allowed within gas cabinets or fume hoods.

  6004.1.1.2 Group R occupancies. Toxic and highly toxic compressed gases shall not be stored or used in Group R occupancies.

  6004.1.1.3 Offices, retail sales and classrooms. Toxic and highly toxic compressed gases shall not be stored or used in offices, retail sales or classroom portions of Group B, F, M or S occupancies. Exception: In classrooms of Group B occupancies, cylinders with a capacity not exceeding 20 cubic feet (0.566 m [3] ) at NTP are allowed in gas cabinets or fume hoods.

  6004.1.2 Gas cabinets. Gas cabinets containing highly toxic or toxic compressed gases shall comply with Section 5003.8.6 and the following requirements:

  60-4 2025 CALIFORNIA FIRE CODE

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

  HIGHLY TOXIC AND TOXIC MATERIALS

  1. The average ventilation velocity at the face of gas cabinet access ports or windows shall be not less than 200 feet per minute (1.02 m/s) with not less than 150 feet per minute (0.76 m/s) at any point of the access port or window.
  2. Gas cabinets shall be connected to an exhaust system.
  3. Gas cabinets shall not be used as the sole means of exhaust for any room or area.
  4. The maximum number of cylinders located in a single gas cabinet shall not exceed three, except that cabinets containing cylinders not exceeding 1 pound (0.454 kg) net contents are allowed to contain up to 100 cylinders.
  5. Gas cabinets required by Section 6004.2 or 6004.3 shall be equipped with an approved automatic sprinkler system in accordance with Section 903.3.1.1. Alternative fire-extinguishing systems shall not be used.