Sección 307 — GRUPO DE ALTO RIESGO H — 2025 California Building Code (Title 24, Part 2)

[F] 307.1 Grupo H de alto riesgo. La ocupación del Grupo H de alto riesgo incluye, entre otras, el uso de un edificio o estructura, o una parte del mismo, que implique la fabricación, procesamiento, generación o almacenamiento de materiales que constituyan un peligro físico o para la salud en cantidades que excedan las permitidas en áreas de control que cumplan con la Sección 414, basándose en los límites máximos permitidos para áreas de control establecidos en las Tablas 307.1(1) y 307.1(2). Las ocupaciones peligrosas se clasifican en los Grupos H-1, H-2, H-3, H-4 y H-5 y deberán cumplir con esta sección, los requisitos de la Sección 415 y el California Fire Code. Los materiales peligrosos almacenados o usados sobre techos o toldos se clasificarán como almacenamiento o uso en azoteas y deberán cumplir con el California Fire Code.

el 18 de julio de 2025 11:14 AM (CDT) BAJO ELLO.

CLASIFICACIÓN Y USO DE LA OCUPACIÓN

[F] TABLE 307.1(1)—MAXIMUM ALLOWABLE QUANTITY PER
CONTROL AREA OF HAZARDOUS MATERIALS POSING A PHYSICAL HAZARDa, i, l, m

MATERIAL	CLASS	GROUP WHEN THE MAXIMUM ALLOWABLE QUANTITY IS EXCEEDED	STORAGEb	STORAGEb	STORAGEb	USE-CLOSED SYSTEMSb	USE-CLOSED SYSTEMSb	USE-CLOSED SYSTEMSb	USE-OPEN SYSTEMSb	USE-OPEN SYSTEMSb
MATERIAL	CLASS	GROUP WHEN THE MAXIMUM ALLOWABLE QUANTITY IS EXCEEDED	Solid pounds (cubic feet)	Liquid gallons (pounds)	Gas (cubic feet at NTP)	Solid pounds (cubic feet)	Liquid gallons (pounds)	Gas (cubic feet at NTP)	Solid pounds (cubic feet)	Liquid gallons (pounds)
Combustible dust	NA	H-2	See Note o	NA	NA	See Note o	NA	NA	See Note o	NA
Combustible fibero	Loose	H-3	(100)	NA	NA	(100)	NA	NA	(20)	NA
Combustible fibero	Baled	Baled	(1,000)	(1,000)	(1,000)	(1,000)	(1,000)	(1,000)	(200)	(200)
Combustible liquidn	II	H-2 or H-3	NA	120d, e	NA	NA	120d	NA	NA	30d
Combustible liquidn	IIIA	H-2 or H-3	H-2 or H-3	330d, e	330d, e	330d, e	330d	330d	330d	80d
Combustible liquidn	IIIB	NA	NA	13,200e, f	13,200e, f	13,200e, f	13,200f	13,200f	13,200f	3,300f
Cryogenic flammable	NA	H-2	NA	45d	NA	NA	45d	NA	NA	10d
Cryogenic inert	NA	NA	NA	NA	NL	NA	NA	NL	NA	NA
Cryogenic oxidizing	NA	H-3	NA	45d	NA	NA	45d	NA	NA	10d
Explosives	Division 1.1	H-1	1e, g	(1)e, g	NA	0.25g	(0.25)g	NA	0.25g	(0.25)g
Explosives	Division 1.2	H-1	1e, g	(1)e, g	(1)e, g	0.25g	(0.25)g	(0.25)g	0.25g	(0.25)g
Explosives	Division 1.3	H-1 or H-2	5e, g	(5)e, g	(5)e, g	1g	(1)g	(1)g	1g	(1)g
Explosives	Division 1.4	H-3	50e, g	(50)e, g	(50)e, g	50g	(50)g	(50)g	NA	NA
Explosives	Division 1.4G	H-3	125e, k	NA	NA	NA	NA	NA	NA	NA
Explosives	Division 1.5	H-1	1e, g	(1)e, g	(1)e, g	0.25g	(0.25)g	(0.25)g	0.25g	(0.25)g
Explosives	Division 1.6	H-1	1e, g	NA	NA	NA	NA	NA	NA	NA
Flammable gas	Gaseous 1A (High BV)p	H-2	NA	NA	1,000d, e	NA	NA	1,000d, e	NA	NA
Flammable gas	Gaseous 1B (High BV)p	Gaseous 1B (High BV)p	Gaseous 1B (High BV)p	Gaseous 1B (High BV)p	Gaseous 1B (High BV)p	Gaseous 1B (High BV)p	Gaseous 1B (High BV)p	Gaseous 1B (High BV)p	Gaseous 1B (High BV)p	Gaseous 1B (High BV)p
Flammable gas	Gaseous 1B (Low BV)p	Gaseous 1B (Low BV)p	Gaseous 1B (Low BV)p	Gaseous 1B (Low BV)p	162,500d, e	162,500d, e	162,500d, e	162,500d, e	162,500d, e	162,500d, e
Flammable gas	Liquefied 1A (High BV)p	Liquefied 1A (High BV)p	Liquefied 1A (High BV)p	(150)d, e	NA	NA	(150)d, e	NA	NA	NA
Flammable gas	Liquefied 1B (High BV)p	Liquefied 1B (High BV)p	Liquefied 1B (High BV)p	Liquefied 1B (High BV)p	Liquefied 1B (High BV)p	Liquefied 1B (High BV)p	Liquefied 1B (High BV)p	Liquefied 1B (High BV)p	Liquefied 1B (High BV)p	Liquefied 1B (High BV)p
Flammable gas	1B (Low BV)p	1B (Low BV)p	1B (Low BV)p	(10,000)d, e	(10,000)d, e	(10,000)d, e	(10,000)d, e	(10,000)d, e	(10,000)d, e	(10,000)d, e
Flammable liquidn	IA	H-2 or H-3	NA	30d, e	NA	NA	30d	NA	NA	10d
Flammable liquidn	IB and IC	IB and IC	IB and IC	120d, e	120d, e	120d, e	120d	120d	120d	30d
Flammable liquid, combi- nation (IA, IB, IC)n	NA	H-2 or H-3	NA	120d, e, h	NA	NA	120d, h	NA	NA	30d, h
Flammable solid	NA	H-3	125d, e	NA	NA	125d	NA	NA	25d	NA
Inert gas	Gaseous	NA	NA	NA	NL	NA	NA	NL	NA	NA
Inert gas	Liquefied	NA	NA	NA	NL	NA	NA	NL	NA	NA

3-8 CÓDIGO DE CONSTRUCCIÓN DE CALIFORNIA 2025

el 18 de julio de 2025 11:14 AM (CDT) BAJO EL MISMO.

CLASIFICACIÓN Y USO DE LA OCUPACIÓN

[F] TABLE 307.1(1)—MAXIMUM ALLOWABLE QUANTITY PER
CONTROL AREA OF HAZARDOUS MATERIALS POSING A PHYSICAL HAZARDa, i, l, m—continued

MATERIAL	CLASS	GROUP WHEN THE MAXIMUM ALLOWABLE QUANTITY IS EXCEEDED	STORAGEb	STORAGEb	STORAGEb	USE-CLOSED SYSTEMSb	USE-CLOSED SYSTEMSb	USE-CLOSED SYSTEMSb	USE-OPEN SYSTEMSb	USE-OPEN SYSTEMSb
MATERIAL	CLASS	GROUP WHEN THE MAXIMUM ALLOWABLE QUANTITY IS EXCEEDED	Solid pounds (cubic feet)	Liquid gallons (pounds)	Gas (cubic feet at NTP)	Solid pounds (cubic feet)	Liquid gallons (pounds)	Gas (cubic feet at NTP)	Solid pounds (cubic feet)	Liquid gallons (pounds)
Organic peroxide	UD	H-1	1e, g	(1)e, g	NA	0.25g	(0.25)g	NA	0.25g	(0.25)g
Organic peroxide	I	H-2	5d, e	(5)d, e	(5)d, e	1d	(1)d	(1)d	1d	(1)d
Organic peroxide	II	H-3	50d, e	(50)d, e	(50)d, e	50d	(50)d	(50)d	10d	(10)d
Organic peroxide	III	H-3	125d, e	(125)d, e	(125)d, e	125d	(125)d	(125)d	25d	(25)d
Organic peroxide	IV	NA	NL	NL	NL	NL	NL	NL	NL	NL
Organic peroxide	V	NA	NL	NL	NL	NL	NL	NL	NL	NL
Oxidizer	4	H-1	1g	(1)e, g	NA	0.25g	(0.25)g	NA	0.25g	(0.25)g
Oxidizer	3j	H-2 or H-3	10d, e	(10)d, e	(10)d, e	2d	(2)d	(2)d	2d	(2)d
Oxidizer	2	H-3	250d, e	(250)d, e	(250)d, e	250d	(250)d	(250)d	50d	(50)d
Oxidizer	1	NA	4,000e, f	(4,000)e, f	(4,000)e, f	4,000f	(4,000)f	(4,000)f	1,000f	(1,000)f
Oxidizing gas	Gaseous	H-3	NA	NA	1,500d, e	NA	NA	1,500d, e	NA	NA
Oxidizing gas	Liquefied	Liquefied	Liquefied	(150)d, e	NA	NA	(150)d, e	NA	NA	NA
Pyrophoric	NA	H-2	4e, g	(4)e, g	50e, g	1g	(1)g	10e, g	0	0
Unstable (reactive)	4	H-1	1e, g	(1)e, g	10e, g	0.25g	(0.25)g	2e, g	0.25g	(0.25)g
Unstable (reactive)	3	H-1 or H-2	5d, e	(5)d, e	50d, e	1d	(1)d	10d, e	1d	(1)d
Unstable (reactive)	2	H-3	50d, e	(50)d, e	750d, e	50d	(50)d	750d, e	10d	(10)d
Unstable (reactive)	1	NA	NL	NL	NL	NL	NL	NL	NL	NL
Water reactive	3	H-2	5d, e	(5)d, e	NA	5d	(5)d	NA	1d	(1)d
Water reactive	2	H-3	50d, e	(50)d, e	(50)d, e	50d	(50)d	(50)d	10d	(10)d
Water reactive	1	NA	NL	NL	NL	NL	NL	NL	NL	NL
For SI: 1 cubic foot = 0.028 m3, 1 pound = 0.454 kg, 1 gallon = 3.785 L. NL = Not Limited; NA = Not Applicable; UD = Unclassified Detonable. a. For use of control areas, see Section 414.2. b. The aggregate quantity in use and storage shall not exceed the maximum allowable quantity for storage, including applicable increases. c._ Reserved. d. [SFM] In other than Group L occupancies,maximum allowable quantities shall be increased 100 percent in buildings equipped throughout with an automatic sprinkler system in accordance with Section 903.3.1.1. Where Note e also applies, the increase for both notes shall be applied accumulatively. e. Maximum allowable quantities shall be increased 100 percent when stored in approved storage cabinets, day boxes, gas cabinets, gas rooms or exhausted enclosures or in listed safety cans in accordance with Section 5003.9.10 of the_California Fire Code. Where Note d also applies, the increase for both notes shall be applied accumulatively. f. Quantities shall not be limited in a building equipped throughout with an automatic sprinkler system in accordance with Section 903.3.1.1. g. Allowed only in buildings equipped throughout with an automatic sprinkler system in accordance with Section 903.3.1.1. h. Containing not more than the maximum allowable quantity per control area of Class IA, IB or IC flammable liquids. i. Quantities in parentheses indicate quantity units in parentheses at the head of each column. j. A maximum quantity of 220 pounds of solid or 22 gallons of liquid Class 3 oxidizers is allowed when such materials are necessary for maintenance purposes, operation or sani- tation of equipment when the storage containers and the manner of storage are approved. k. Net weight of the pyrotechnic composition of the fireworks. Where the net weight of the pyrotechnic composition of the fireworks is not known, 25 percent of the gross weight of the fireworks, including packaging, shall be used. l. For gallons of liquids, divide the amount in pounds by 10 in accordance with Section 5003.1.2 of the_California Fire Code_. m.For oxidizers, unstable (reactive) materials, and water-reactive materials stored or displayed in Group M occupancies or stored in Group S occupancies, see Section 414.2.5.1. n. For flammable and combustible liquid storage in Group M occupancy wholesale and retail sales uses, see Section 414.2.5.2. o. Where manufactured, generated or used in such a manner that the concentration and conditions create a fire or explosion hazard based on information prepared in accor- dance with Section 414.1.3. p._ High Burning Velocity_(High BV) Category 1B flammable gas has a burning velocity greater than 3.9 inches per second (10 cm/s).Low Burning Velocity (Low BV) Category 1B flammable gas has a burning velocity of 3.9 inches per second (10 cm/s) or less.

el 18 de julio de 2025 11:14 AM (CDT) BAJO EL MISMO.

�

CLASIFICACIÓN Y USO DE LA OCUPACIÓN

[F] TABLE 307.1(2)—MAXIMUM ALLOWABLE QUANTITY PER
CONTROL AREA OF HAZARDOUS MATERIALS POSING A HEALTH HAZARDa, h, i

MATERIAL	STORAGEb	STORAGEb	STORAGEb	USE-CLOSED SYSTEMSb	USE-CLOSED SYSTEMSb	USE-CLOSED SYSTEMSb	USE-OPEN SYSTEMSb	USE-OPEN SYSTEMSb
MATERIAL	Solid poundsd, e, f	Liquid gallons (pounds)d, e, f	Gas cubic feet at NTP (pounds)d	Solid poundsd	Liquid gallons (pounds)d	Gas cubic feet at NTP (pounds)d	Solid poundsd	Liquid gallons (pounds)d
Corrosives	5,000	500	Gaseous 810e	5,000	500	Gaseous 810e	1,000	100
Corrosives	5,000	500	Liquefied (150)	Liquefied (150)	Liquefied (150)	Liquefied (150)	Liquefied (150)	Liquefied (150)
Highly Toxic	10	(10)	Gaseous 20g	10	(10)	Gaseous 20g	3	(3)
Highly Toxic	10	(10)	Liquefied (4)g	Liquefied (4)g	Liquefied (4)g	Liquefied (4)g	Liquefied (4)g	Liquefied (4)g
Toxic	500	(500)	Gaseous 810e	500	(500)	Gaseous 810e	125	(125)
Toxic	500	(500)	Liquefied (150)e	Liquefied (150)e	Liquefied (150)e	Liquefied (150)e	Liquefied (150)e	Liquefied (150)e
For SI: 1 cubic foot = 0.028 m3, 1 pound = 0.454 kg, 1 gallon = 3.785 L. a. For use of control areas, see Section 414.2. b. The aggregate quantity in use and storage shall not exceed the maximum allowable quantity for storage, including applicable increases. c._ Reserved. d. [SFM] In other than Group L occupancies,maximum allowable quantities shall be increased 100 percent in buildings equipped throughout with an approved automatic sprin- kler system in accordance with Section 903.3.1.1. Where Note e also applies, the increase for both notes shall be applied accumulatively. e. Maximum allowable quantities shall be increased 100 percent where stored in approved storage cabinets, gas cabinets or exhausted enclosures as specified in the_California Fire Code. Where Note d also applies, the increase for both notes shall be applied accumulatively. f. For corrosive, highly toxic and toxic materials stored or displayed in Group M occupancies or stored in Group S occupancies, see Section 414.2.5.1. g. Allowed only where stored in approved exhausted gas cabinets or exhausted enclosures as specified in the_California Fire Code_. h. Quantities in parentheses indicate quantity units in parentheses at the head of each column. i. For gallons of liquids, divide the amount in pounds by 10 in accordance with Section 5003.1.2 of the_California Fire Code_.

[F] 307.1.1 Exenciones de Ocupación. El almacenamiento, uso y manejo de materiales peligrosos de acuerdo con la Tabla 307.1.1 no se contará como parte de las Cantidades Máximas Permitidas y no causará que la clasificación de una ocupación sea del Grupo H. Dicho almacenamiento, uso y manejo deberá cumplir con las disposiciones aplicables del California Fire Code.

TABLE 307.1.1—HAZARDOUS MATERIALS EXEMPTIONSa

MATERIAL CLASSIFICATION	OCCUPANCY OR APPLICATION	EXEMPTION
Combustible fiber	Baled cotton	Densely packed baled cotton shall not be classified as combustible fiber, provided that the bales comply with the packing requirements of ISO 8115.
Corrosive	Building materials	The quantity of commonly used building materials that are classified as corro- sive materials is not limited.
Corrosive	Personal and household products	The quantity of personal and household products that are classified as corrosive materials is not limited in retail displays, provided that the products are in origi- nal packaging.
Corrosive	Retail and wholesale sales occupancies	The quantity of medicines, foodstuffs or consumer products, and cosmetics containing not more than 50 percent by volume of water-miscible liquids, with the remainder of the solutions not being flammable, is not limited. To qualify for this allowance, such materials shall be packaged in individual containers not exceeding 1.3 gallons.
Explosives	Groups B, F, M and S	Storage of special industrial explosive devices is not limited.
Explosives	Groups M and R-3	Storage of black powder, smokeless propellant and small arms primers is not limited.
Flammable and combusti- ble liquids and gases	Aerosols	Buildings and structures occupied for the storage of aerosol products, aerosol cooking spray products, or plastic aerosol 3 products shall be classified as Group S-1.
Flammable and combusti- ble liquids and gases	Alcoholic beverages	The quantity of alcoholic beverages in liquor stores and distributors without bulk storage is not limited.
Flammable and combusti- ble liquids and gases	Alcoholic beverages	The quantity of alcoholic beverages in distilling or brewing of beverages is not limited.

3-10 CÓDIGO DE CONSTRUCCIÓN DE CALIFORNIA 2025

el 18 de julio de 2025 11:14 AM (CDT) BAJO EL MISMO.

CLASIFICACIÓN Y USO DE LA OCUPACIÓN

TABLE 307.1.1—HAZARDOUS MATERIALS EXEMPTIONSa—continued

MATERIAL CLASSIFICATION	OCCUPANCY OR APPLICATION	EXEMPTION
Flammable and combusti- ble liquids and gases— continued	Alcoholic beverages— continued	The storage quantity of beer, distilled spirits and wines in barrels and casks is not limited.
Flammable and combusti- ble liquids and gases— continued	Alcoholic beverages— continued	The quantity of alcoholic beverages in retail and wholesale sales occupancies is not limited. To qualify for this allowance, beverages shall be packaged in indi- vidual containers not exceeding 1.3 gallons.
Flammable and combusti- ble liquids and gases— continued	Cleaning establishments with combustible liquid solvents	The quantity of combustible liquid solvents used in closed systems and having a flash point at or above 140ºF is not limited. To qualify for this allowance, equip- ment shall be listed by an approved testing agency and the occupancy shall be separated from all other areas of the building by 1-hour fire barriers constructed in accordance with Section 707 or 1-hour horizontal assemblies constructed in accordance with Section 711, or both
Flammable and combusti- ble liquids and gases— continued	Cleaning establishments with combustible liquid solvents	The quantity of combustible liquid solvents having a flash point at or above 200ºF is not limited.
Flammable and combusti- ble liquids and gases— continued	Closed piping systems	The quantity of flammable and combustible liquids and gases utilized for the operation of machinery or equipment is not limited.
Flammable and combusti- ble liquids and gases— continued	Fuel	The quantity of liquid or gaseous fuel in fuel tanks on vehicles or motorized equipment is not limited.
Flammable and combusti- ble liquids and gases— continued	Fuel	The quantity of gaseous fuels in piping systems and fixed appliances regulated by the_International Fuel Gas Code_ is not limited.
Flammable and combusti- ble liquids and gases— continued	Fuel	The quantity of liquid fuels in piping systems and fixed appliances regulated by the_California Mechanical Code_ is not limited.
Flammable and combusti- ble liquids and gases— continued	Flammable finishing opera- tions using flammable and combustible liquids	Buildings and structures occupied for the application of flammable finishes shall comply with Section 416.
Flammable and combusti- ble liquids and gases— continued	Fuel oil	The quantity of fuel oil storage complying with Section 605.4.2 of the_California_ Fire Code is not limited.
Flammable and combusti- ble liquids and gases— continued	Hand sanitizer	The quantity of alcohol-based hand rubs (ABHR) classified as Class I or II liquids in dispensers installed in accordance with Sections 5705.5 and 5705.5.1 of the California Fire Code is not limited. The location of the ABHR dispensers shall be provided in the construction documents.
Flammable and combusti- ble liquids and gases— continued	Retail and wholesale sales occupancies with flammable and combustible liquids	The quantity of medicines, foodstuffs or consumer products, and cosmetics containing not more than 50 percent by volume of water-miscible liquids, with the remainder of the solutions not being flammable, is not limited. To qualify for this allowance, such materials shall be packaged in individual containers not exceeding 1.3 gallons.
Highly toxic and toxic materials	Retail and wholesale sales occupancies	The quantity of medicines, foodstuffs or consumer products, and cosmetics containing not more than 50 percent by volume of water-miscible liquids, with the remainder of the solutions not being flammable, is not limited. To qualify for this allowance, such materials shall be packaged in individual containers not exceeding 1.3 gallons.
Any	Agricultural materials	The quantity of agricultural materials stored or utilized for agricultural purposes on the premises is not limited.
Any	Energy storage	The quantity of hazardous materials in stationary storage battery systems is not limited.
Any	Energy storage	The quantity of hazardous materials in stationary fuel cell power systems is not limited.
Any	Energy storage	The quantity of hazardous materials in capacitor energy storage systems is not limited.
Any	Refrigeration Systems	The quantity of refrigerants in refrigeration systems is not limited.
For SI: 1 gallon = 3.785L, °C = (°F - 32)/1.8. a. Exempted materials and conditions listed in this table are required to comply with applicable provisions of the_ California Fire Code_.

[F] 307.2 Materiales peligrosos. Los materiales peligrosos en cualquier cantidad deberán cumplir con los requisitos de este código, incluyendo la Sección 414 y el California Fire Code.

[F] 307.3 Grupo de alto riesgo H-1. Los edificios y estructuras que contengan materiales que representen un riesgo de detonación deberán clasificarse como Grupo H-1. Tales materiales incluirán, pero no se limitarán a, los siguientes:

Materiales pirofóricos detonables

Explosivos:

División 1.1

División 1.2

[F] 307.3.1 Ocupaciones que contienen explosivos no clasificados como H-1. Las siguientes ocupaciones que contienen materiales explosivos deberán clasificarse como sigue:

Los materiales explosivos de la División 1.3 que se usen y mantengan en una forma donde ni el confinamiento ni la configuración eleven el riesgo de un incendio masivo a un riesgo de explosión masiva se permitirán en ocupaciones del Grupo H-2.
Los materiales explosivos de la División 1.4 se permitirán en ocupaciones del Grupo H-3.
Artículos, incluidos los artículos empaquetados para envío, que no estén regulados como explosivos de División 1.4 bajo las regulaciones del Bureau of Alcohol, Tobacco, Firearms and Explosives, o artículos sin empaquetar usados en operaciones de proceso que no propaguen una detonación o deflagración entre artículos, se permitirán en ocupaciones del Grupo H-3.

[F] 307.4 Grupo de alto riesgo H-2. Los edificios y estructuras que contengan materiales que representen un riesgo de deflagración o un riesgo por combustión acelerada deberán clasificarse como Grupo H-2. Tales materiales incluirán, pero no se limitarán a, los siguientes:

Líquidos inflamables o combustibles Clase I, II o IIIA que se usen o almacenen en recipientes o sistemas normalmente abiertos, o en recipientes o sistemas cerrados presurizados a más de 15 libras por pulgada cuadrada de presión manométrica (103.4 kPa).

Polvos combustibles donde se fabriquen, generen o usen de tal manera que la concentración y condiciones creen un riesgo de incendio o explosión basado en información preparada conforme a la Sección 414.1.3.

Fluidos criogénicos inflamables.

Gases inflamables Categoría 1A.

Gases inflamables Categoría 1B con una velocidad de combustión mayor a 3.9 pulgadas por segundo (10 cm/s).

Peróxidos orgánicos, Clase I.

Oxidantes, Clase 3, que se usen o almacenen en recipientes o sistemas normalmente abiertos, o en recipientes o sistemas cerrados presurizados a más de 15 libras por pulgada cuadrada de presión manométrica (103 kPa).

Líquidos, sólidos y gases pirofóricos, no detonables.

Materiales inestables (reactivos), Clase 3, no detonables.

Materiales reactivos al agua, Clase 3.

[F] 307.5 Grupo de alto riesgo H-3. Los edificios y estructuras que contengan materiales que soporten la combustión fácilmente o que representen un riesgo físico deberán clasificarse como Grupo H-3. Tales materiales incluirán, pero no se limitarán a, los siguientes:

Líquidos inflamables o combustibles Clase I, II o IIIA que se usen o almacenen en recipientes o sistemas normalmente cerrados presurizados a 15 libras por pulgada cuadrada de presión manométrica (103.4 kPa) o menos.

Fibras combustibles, distintas al algodón empacado densamente en pacas, donde se fabriquen, generen o usen de tal manera que la concentración y condiciones creen un riesgo de incendio o explosión basado en información preparada conforme a la Sección 414.1.3.

Fuegos artificiales de consumo, 1.4G (Clase C, Común).

Fluidos criogénicos oxidantes.

Gases inflamables Categoría 1B con una velocidad de combustión de 3.9 pulgadas por segundo (10 cm/s) o menos.

Sólidos inflamables.

Peróxidos orgánicos, Clases II y III.

Oxidantes, Clase 2.

Oxidantes, Clase 3, que se usen o almacenen en recipientes o sistemas normalmente cerrados presurizados a 15 libras por pulgada cuadrada de presión manométrica (103 kPa) o menos.

Gases oxidantes.

Materiales inestables (reactivos), Clase 2.

Materiales reactivos al agua, Clase 2.

[F] 307.6 Grupo de alto riesgo H-4. Los edificios y estructuras que contengan materiales que representen riesgos para la salud deberán clasificarse como Grupo H-4. Tales materiales incluirán, pero no se limitarán a, los siguientes:

Corrosivos.

Materiales altamente tóxicos.

Materiales tóxicos.

[F] 307.7 Grupo de alto riesgo H-5. Las instalaciones de fabricación de semiconductores y áreas comparables de investigación y desarrollo en las que se usen materiales de producción peligrosos (HPM, por sus siglas en inglés) y la cantidad agregada de materiales exceda las especificadas en las Tablas 307.1(1) y 307.1(2) deberán clasificarse como Grupo H-5. Tales instalaciones y áreas deberán diseñarse y construirse conforme a la Sección 415.11.

[F] 307.8 Riesgos múltiples. Los edificios y estructuras que contengan un material o materiales que representen riesgos clasificados en uno o más de los Grupos H-1, H-2, H-3 y H-4 deberán cumplir con los requisitos del código para cada una de las ocupaciones así clasificadas.