Selection by hazard.

TM 38-400/NAVSUP PUB 572/AFMAN 23-210 MCO 4450.14/DLAM 4145.12

writers' Laboratories, Incorporated, or (2)

NOTE

Federal agencies such as Bureau of Mines,

Carbon dioxide extinguishers equipped with

Department of the Interior; Department of

metal horns are not considered safe for use

on fires in energized electrical equipment and,

Transportation, or U.S. Coast Guard, which

therefore, are not classified for use on class C

issue approvals for such equipment.

hazards.

6-31. Selection by hazard.

d. Extinguishers and extinguishing agents for the

Extinguishers will be selected for the specific class or

protection of class D hazards will be approved for use

classes of hazards to be protected in accordance with

on the specific combustible metal hazard.

the following:

a. Extinguishers for protecting class A hazards will

6-32. Distribution of portable fire extinguishers.

be selected from the following: foam, loaded stream,

a. The number of fire extinguishers needed to

multipurpose dry chemical, and water types. Certain

protect a property will be determined as prescribed

smaller extinguishers which are charged with

herein, considering the area and arrangement of the

multipurpose dry chemical are rated on class B and

building or occupancy, the severity of the hazard, the

class C fires, but have insufficient effectiveness to earn

anticipated classes of fires, and the distances to be

the minimum 1-A rating even though they have value in

traveled to reach extinguishers.

extinguishing smaller class A fires.

Such smaller

b. Fire extinguishers will be provided for the

extinguishers will not be used to meet the requirements

protection of the building structure, if combustible, and

of paragraph m below.

the occupancy hazards contained therein.

b. Extinguishers for protection of class B hazards

c. Required building protection will be provided by

will

selected

from

the

following:

fire extinguishers suitable for class A fires.

bromotrifluoromethane, carbon dioxide, dry chemical,

d. Occupancy hazard protection will be provided

foam, loaded stream, and multipurpose dry chemical.

by fire extinguishers suitable for such class A, B, C, or D

Extinguishers with ratings less than 1B shall not be

fire potentials as may be present.

considered in determining suitability.

e. Extinguishers provided for building protection

c. Extinguishers for protection of class C hazards

may be considered also for the protection of

will

selected

from

the

following:

occupancies having a class A fires potential.

bromotrifluoromethane, carbon dioxide, dry chemical,

and multipurpose dry chemical.

Table 6-1. Areas To Be Protected per Extinquisher.

Basic minimum extin

Maximum travel

Light hazard

Ordinary hazard

Extra hazard occupancy

guisher rating for

distances to

occupancy (sq ft)

occupancy(sq ft)

(sq ft)

area specified

extinguishers (ft)

3,000

See Note

6,000

3,000

See Note

9,000

4,500

3,000

11,250

6,000

4,000

11,250

9,000

6,000

Note. Not permitted except as specified in 14b.

6-33. Fire extinguisher size and placement for class

f. Combustible buildings having an occupancy

A hazards.

hazard subject to class B and/or class C fires will have a

a. Minimal sizes of fire extinguishers for the listed

standard complement of class A fire extinguishers, as

grades of hazard will be provided on the basis of table

required by table 1 for building protection, plus

6-1. Extinguishers will be located so that the maximum

additional class B and/or class C extinguishers. Where

fire extinguishers have more than one letter

travel distances will not exceed those specified in table

6-1.

classification such as 2-A, 2-B, or C, they may be

considered to satisfy the requirements of each letter

b. The protection requirements specified in table 6-

class.

1 may be fulfilled by several extinguishers of lower

g. Rooms or areas will be graded generally as light

ratings for ordinary or extra hazard occupancies.

hazard, ordinary hazard, or extra hazard. Limited areas

of greater or lesser hazard will be protected, as required.

6-7