MIL-PRF-24755B(SH)
4.8.2 Internal composite materials. All composite materials used on components internal to the fan, including
impeller, casing, and motor shall meet the smoke obscuration (ASTM E662) test as follows:
Ds during 300 sec (flaming)
6 (4 minutes)
Ds during 300 sec (nonflaming)
1 (4 minutes)
Dmax (flaming)
81
Dmax (nonflaming)
32
and the Combustion Gas (ASTM E800) test as follows:
Combustion Gas
Flaming
Nonflaming
CO
75
10
CO2
2.0%
0.4%
HF
<1
<1
HCl
13
1
NOx
1
<0.5
<1
<1
SO2
HCN
1
<1
<3
<3
NH3
<0.1
<0.1
COC2
4.9 Permeability tests. A permeability test of nonmagnetic material used in construction of the fan shall be
conducted in accordance with MIL-STD-2142, Test 501 (see 3.2.4).
4.10 Maintainability demonstration. The first production unit shall be examined after testing, and the
capability to maintain, disassemble, and repair the unit shall be demonstrated. The demonstration shall be conducted
utilizing the recommended tools and with other than expert mechanics. Evidence that maintainability of the fan-
motor assembly cannot be accomplished by other than expert mechanics shall be cause for failure of the
demonstration. The maintainability demonstration shall include but not be limited to the following (see 3.9):
Removal of fan impeller.
a.
b.
Removal of motor.
c.
Removal of motor bearing.
5. PACKAGING
5.1 Packaging. For acquisition purposes, the packaging requirements shall be as specified in the contract or
order (see 6.2). When packaging of materiel is to be performed by DoD or in-house contractor personnel, these
personnel need to contact the responsible packaging activity to ascertain requisite packaging requirements.
Packaging requirements are maintained by the Inventory Control Point's packaging activities within the Military
Service or Defense Agency, or within the military service's system commands. Packaging data retrieval is available
from the managing Military Department's or Defense Agency's automated packaging files, CD-ROM products, or
by contacting the responsible packaging activity.
6. NOTES
(This section contains information of a general or explanatory nature that may be helpful, but it is not
mandatory.)
6.1 Intended use. The fan-motor units specified herein are intended for ventilation applications onboard ships
of the United States Navy. Fans are high efficiency units intended for systems having a resistance of 14 inches of
water.
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