MIL-PRF-44408C
products. Weather seals and EMI gaskets shall either meet the requirements above
or be easily replaceable.
3.2.5 Pressurization. The shelter shall be capable of being pressurized to
withstand overpressurization of 1.2 inches water gauge (iwg) with an air leakage
not to exceed 10 standard cubic feet per minute (scfm) for Types I and III, and 15
scfm for Type II with the ventilation port covered and sealed. Additionally the
Type II shelter with the ventilation port opened shall have an air leakage of 40
to 50 scfm, at an overpressurization of .75 iwg.
3.2.5.1 Ventilation port. The Type II shelter shall be equipped with an air
flow passage that functions in conjunction with the Chemical Avoidance Protective
Entrance CAPE (see interface drawing 17-2-0035) and Gas Particulate Filter Unit
GPFU (NSN 4240-01-231-6515). Based on two people in the shelter, 40 cfm of
ventilation air flow is required and the GPFU will nominally provide an
overpressure of 0.75 iwg. The airflow passage shall be in the shelter door to
allow ventilation of the space between the CAPE and the shelter door. The passage
shall prevent dust and contaminants from entering the shelter when no ventilation
air flow is being provided. An exterior cover may be used to meet this
requirement. The cover shall not be a separate item. In routine conditions the
air flow passage will be open. While open, the passage shall maintain the weather
tightness and EMI integrity of the shelter.
3.2.6 Roof loads. The shelter roof shall be capable of supporting, without
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damage or degradation; (1) a uniformly distributed load of 40 lbs/ft over the
entire surface and (2) a concentrated load of 660 lbs over a 1 ft x 2 ft area,
applied anywhere on the roof.
3.2.7 Floor loads. The shelter floor shall be capable of supporting, without
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damage or degradation; (1) a uniformly distributed load of 65 lbs/ft over the
entire floor, (2) a concentrated load of 1000 lbs applied over a 1 ft x 2 ft
area, and (3) a point load of 125 lbs, over one square inch.
3.2.8
Door.
3.2.8.1 Door handle. From either side, the shelter door shall be capable of
being opened and closed with a maximum force of 48 lbs applied to the door handle.
From inside the shelter, the shelter door shall be capable of being opened and
closed with a maximum force of 48 lbs applied to the door handle with the outside
handle locked. The door shall be capable of being padlocked from the outside.
3.2.8.2 Door structure and hinge assembly. The door and hinge assembly shall
be capable of supporting a 200 lb static load applied parallel to the hinge line,
along the door edge opposite the hinge, with the door open to 90 degrees, without
degradation or damage to the door or door hardware and the door shall operate
freely after such a load is applied.
3.2.8.3 Door stop. The door shall include a door stop capable of automatically
latching the door, when opened, at 90 degrees. The stop shall automatically
prevent the door from swinging beyond 90 degrees when engaged and allow the door
to open 180 degrees when disengaged. The door stop shall be capable of being
disengaged by personnel, while they are standing on the ground, when the shelter
is mounted on the HMMWV and shall not obstruct entry/exit through the door. The
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door stop shall be capable of withstanding a static load equal to 10 lb/ft times
the largest surface area of the door. The load shall be applied normal to the
door's largest surface and on the edge opposite the hinge, with the door latched
at 90 degrees. The door and its hardware shall be capable of withstanding these
loads without degradation, damage, or improper door operation.
3.2.8.4 Door maintainability. The door shall not be removable from the
exterior when locked and shall be easily removable with hand tools when unlocked.
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