MIL-PRF-46736E
the actual air flow. See figure 1 for percentage of rated
airflow variations. The dust rate shall not vary more than
+0.177 g/m3 (0.005 g/ft3) during any part of applicable
test.
g. Scavenge airflow rate - The scavenge air flow rate shall be set per
MIL-PRF-62048 requirements (see A.3.5). Air cleaners
equipped with scavenge air aspirators or similar types
(non-electric blowers) shall provide a 10% scavenge flow
of the actual air flowing through the air cleaner.
4.4 Operating requirements verification.
4.4.1 Flame resistance. One side of filter element media shall be exposed to a flame until
the media burns or glows. The flame shall then be removed and the filter element media shall be
observed.
4.4.2 Crush resistance. The filter element shall be placed in a device capable of measuring
pressure (load) applied to the element end to end (excluding the gaskets) and the specified load
shall be applied. Upon removal of the load, there shall be no physical evidence of structural
damage to any part of the filter element or reduction in filter element end to end length (not
including end cap gaskets height).
4.4.3 Efficiency. The air cleaner assembly shall be set up in accordance with
figures 2 or 3, of MIL-PRF-62048 and the air adjusted to rated flow. Fine dust shall be fed at
0.883 + 0.176 g/m3 air until 110 grams have been fed or until 30 minutes have been reached,
whichever results in a greater quantity of dust. In air cleaners where the rated airflow face
velocity through the filter element media is 183 cm per minute or less, the dust shall be fed for
60 minutes. The restriction at the start of the test, and at 10 minute intervals throughout the test
shall be determined. The master filter and conductors shall be removed from the test setup taking
care to retain all the entrapped dust, and re-weighed. All dust and master filter weighings shall be
accurate to 0.01 gram. Other weighings shall be accurate to 0.1 grams. The efficiency shall be
computed using the following formula:
Dust Efficiency (%) = (W2-W3) x 100
W1
Where:
W1 - Weight of dust fed.
W2 - Weight of absolute filter and entrapped dust.
W3 - Original weight of absolute filter.
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