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MIL-HDBK-1008B
in every draft-curtained area that is wholly or partially within:
a)  50 feet (15.2 m) of the point measured horizontally for hangars
with ceiling height of 25 feet (7.6 m) or less.
b)  75 feet (23 m) of the point measured horizontally for hangars
with a ceiling height in excess of 25 feet (7.6 m) but not more than 75 feet
(23 m).
c)  100 feet (30.6 m) of the point measured horizontally for
hangars with a ceiling height in excess of 75 feet (23 m).
Note:
For Air Force and Army projects, water supplies to support the
overhead foam-water sprinkler systems shall be sufficient to
meet the following requirements and supplementary systems.  The
system shall be designed to supply all sprinkler heads in the
hydraulically most demanding areas.  The hydraulically most
demanding areas shall be as follows:
(a)
8,000 square feet (740 m2) area where roof or ceiling
height is 25 feet (7.6 m) or less above floor level.
(b)
18,000 square feet (1670 m2) area where roof or
ceiling height is over 25 feet (7.6 m) but not more
than 75 feet (23 m) above floor level.
(c)
35,000 square feet (3250 m2) area where roof or
ceiling height is over 75 feet (23 m) above the floor
level.
4.16.5
Equipment Locations.  Foam concentrate tanks, proportioning
equipment and sprinkler control valves shall be located in a dedicated room
separate from the aircraft servicing area by a minimum of one-hour fire
resistive construction.  Equipment rooms shall be configured or sized to
provide access for inspection, maintenance, and repair of all equipment.
Doors providing direct access to the exterior of the structure shall be
provided.  Equipment shall be located to permit removal of tanks, bladders,
valves, pumps, and motors without the removal of other components.  Designers
should consider using stainless steel piping and pumps to transport foam
concentrate.
4.16.6
Controls Locations.  Fire detection and actuation system controls
shall be installed in an environmentally controlled area not subject to
accidental water leakage.
4.16.7
Agent Requirements.  Only AFFF concentrate meeting Military
Specification MIL-F-24385F, Fire Extinguishing Agent, Aqueous Film-Forming
Foam (AFFF) Liquid Concentrate, for Fresh and Seawater, shall be permitted.
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