Quantcast Limiting Interior Fire Spread

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MIL-HDBK-1008B
2.2.1
Unsprinklered Attics and Suspended Ceilings.  Buildings with an
attic(s) separated from all other areas of the building by two-hour fire rated
construction, are not required to adhere to the criteria of this paragraph.
Draft stops of gypsum board on wood or metal frame are required in
unsprinklered attic spaces of combustible roof construction or in the
unsprinklered combustible suspended ceiling spaces to divide the spaces into
areas not exceeding 3,000 square feet (280 m2).  Self closing and latching
access doors of similar construction shall be provided in the draft stop where
there is no other means of access to the area.
2.3
Building Height Limitations.  Building height limitations shall
conform to the UBC, except as modified herein.
2.4
Special Requirements.
Certain structures shall meet the following
special requirements:
a)  House trailers shall be separated in accordance with NFPA 501A,
Fire Safety Criteria for Manufactured Home Installations, Sites, and
Communities.
b)  Relocatable or prefabricated structures used for other than
family dwellings shall be separated in accordance with the UBC requirements
for permanent buildings.
c)  Relocatable facilities such as electronic equipment vans shall
not be grouped to form areas greater than 6,000 square feet (557.4 m2) for
unsprinklered facilities and 12,000 square feet (1114.8 m2) for sprinklered
facilities.  Relocatable facilities having extra hazardous occupancies as
defined by NFPA 13, Installation of Sprinkler Systems, shall not be grouped to
form areas greater than 4,000 square feet (372 m2) for unsprinklered
facilities and 8,000 square feet (743 m2) for sprinklered facilities.  A
minimum separation of 50 feet (15 m) shall be provided between groups for
extra hazardous and 15 feet (5 m) for all other groups.
2.5
Limiting Interior Fire Spread
2.5.1
Vertical Fire Cutoffs.  Enclosures for stairways, elevators, ducts,
chases, etc., shall be in accordance with the most current edition of the
following criteria:
a)
NFPA 80, Fire Doors and Fire Windows
b)
NFPA 90A, Installation of Air Conditioning and Ventilating
Systems
c)
NFPA 90B, Installation of Warm Air Heating and Air Conditioning
Systems
d)
NFPA 91, Exhaust Systems for Air Conveying of Materials
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