MIL-PRF-46736E
3.3.7 Differential pressure. The assembly shall be capable of withstanding without
damage, a differential pressure of 12.44 kPa (50 in. of water) between the inside and outside of
the assembly.
3.4 Interface requirements.
3.4.1 Envelope interface. The filter shall fully interface with the air cleaner assembly as
specified in MIL-PRF-62048 for which it was designed. Envelope and/or interface dimensions
and rated airflow shall be in accordance with the applicable drawing (see 4.3 and 6.2).
3.5 Ownership and support requirements.
3.5.1 Washing durability. The assembly shall evidence no damage and shall meet the
requirements of 3.3.4, after the filter element has been loaded to capacity (see 6.5.1), then washed
with soap conforming to P-D-245 (type I or type II), rinsed, and dried. Low/no sudsing
commercial detergents may be substituted for P-D-245 (type I or type II).
3.5.2 Marking. The filter element shall be marked with the National Stock Number
(NSN), the manufacturer's name and part number, and the maximum airflow capacity in cubic
meter per minute (m3/min) [cubic foot per minute (ft3/min)].
3.5.3 Quality and safety. Workmanship shall be such that the air cleaner filter element
shall be free of cracked end caps, surfaces out of alignment or out of contour, and missing
portions of material. Sheet metal parts shall be free of burrs, blisters, tears and excessive thinning
at drawn sections, or any condition that might present a safety hazard to operating or maintenance
personnel.
3.6 Operating environment requirements.
3.6.1 Seal ozone resistance. The filter element end cap seals shall be capable of
withstanding air having a high ozone concentration.
3.6.2 Vibration. Unless otherwise specified (see 6.2), the filter element shall withstand
the effects of severe vibration which may be encountered during all operating conditions and
ambient temperatures.
3.6.3 Efficiency after vibration. The assembly shall meet the requirements of 3.3.4 before
and after being subjected to vibration in accordance with 3.6.2 at an ambient temperature of
27 + 3 degree Celsius (°C) (80 + 5 degrees Fahrenheit (°F)).
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