Clearances.

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

e. Above level of roof truss.

When supplies are

(1) When stack heights do not exceed 15

stacked above the horizontal level

of lower roof truss

feet, an 18-inch clearance will be maintained.

members or beams, the horizontal

clearance between

(2) When stack heights exceed 15 feet, a

supplies and structural members

or other installed

36inch clearance will be maintained.

devices will be 18 inches (fig 6-2).

(3) Regardless of their height, stacks in

nonsprinkled buildings will have a 36-inch clearance,

6-51. Clearances.

except that reclaimed metal drums may be stacked

within 14 to 20 inches from metal joists, rafters, beams,

a. General. Clearances between stored materials

and roof trusses in nonsprinkled buildings of all metal

and walls will not be maintained except as follows:

construction and without electrical wiring.

(1) Substandard firewalls (less than 4-hour

d. Light or heating fixtures. Around light or heating

rating) clearance of 24 inches will be maintained (fig 6-

fixtures, an 18-inch clearance will be maintained.

3).

Figure 6-2. Clearance of material from sprinkler heads and trusses.

door except for the portion of the fire door near the

(2) When infestible subsistence items are

aisle. For this portion of the fire door, a 36-inch

stored in general purpose storage buildings, an 18 inch

clearance will be maintained between stock and the fire

clearance will be maintained.

door (fig 6-6). Where a protective barricade is provided

(3) No

clearance

required

when

for the fire door, no clearance between stock and

nonhazardous materials are stored in general purpose

barricade is required.

storage buildings, except a 24-inch clearance around

personnel doors or fire aisles (fig 6-5).

6-52. Aisles.

(4) When materials stored are subject to

Aisles will not be maintained for access to electrical

excessive swelling, clearance usually not exceeding 12-

equipment, fire fighting equipment, or sprinkler valves,

inches (fig 6-6).

except where such equipment or valves cannot

conveniently be moved to a more accessible location.

b. Clearance to maintain nonhazardous materials

storage block limitations. When clearances are found

6-53. Exceptions.

necessary to maintain storage block limitations, such

Exceptions to the requirements may be authorized

clearance between stacks will not be more than 4 feet in

where such exceptions will result in increasing space

width for 2,000-square foot blocks or 6 feet for 8,000-

utilization without materially increasing the fire risk.

square foot blocks.

Requests for such exceptions, with adequate

c. Clearance around fire doors.

A 24-inch

clearance will be maintained between stock and the fire

6-18