MIL-PRF-46736E
3.2.1 Recycled, recovered, or environmentally preferable materials. Recycled, recovered,
or environmentally preferable materials should be used to the maximum extent possible provided
that the material meets or exceeds the operational and maintenance requirements, and promotes
economically advantageous life cycle costs.
3.3 Operating requirements.
3.3.1 Flame resistance. The air filter element shall be self extinguishing after removal of
flame source nor shall it smolder.
3.3.2 Crush resistance. Unless otherwise specified (see 6.2), the filter element shall be
capable of withstanding a 1339 Newtons (N) [300 pounds (lb)] compressive end to end static
load.
3.3.3 Efficiency. The efficiency of the filter element installed in the designed air cleaner
housing (assembly) at rated air flow shall not be less than 99.5%. The particle size distribution by
volume shall be as follows in table I.
TABLE I. Particle size distribution by volume, percent
(%).
Fine grade
Coarse grade
Size, Microns ( m) (% less than)
(% less than)
5.5
38 + 3
13 + 3
11
54 + 3
24 + 3
22
71 + 3
37 + 3
44
89 + 3
56 + 3
88
97 + 3
84 + 3
176
100
100
3.3.4 Dust capacity. Unless otherwise specified (see 6.2), the time for the assembly to
reach load capacity (see 6.5.1) shall be not less than 4 hours for single stage air cleaner design and
20 hours for a multi-stage air cleaner design when feeding dust at a rate specified in 4.3.2.
3.3.5 Post service airflow restriction. Unless otherwise specified by the procuring activity
(see 6.2), following dust capacity test (termed loaded to capacity); (see 6.5.1) and followed by a
cleaning, the assembly's air flow restriction shall not increase by more than 0.248 kilopascal (kPa)
(1 in. of water).
3.3.6 Backfire. Unless otherwise specified (see 6.2), the filter element shall withstand,
without damage, the stresses resulting from an air gage pressure ranging from
69 to 690 kilopascals (kPa) [10 to 100 pounds per square in. gage (psig)].
3
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