MIL-PRF-62048C
blowers) shall provide a 10% scavenge flow of the
actual airflow being flowed through the air cleaner.
3.4.1 Filter element. The filter element shall comply with MIL-PRF-46736. The filter
element shall be firmly positioned in the housing but easily removable for servicing (see 4.5.2).
3.4.2 Air filter blowers. Air filter blowers shall be capable of scavenging in a manner
sufficient to meet service life requirements of the air cleaner (see 4.5.2).
3.4.3 Tubular joints. Air cleaner tubular joints shall have externally beaded ends of
sufficient strength to withstand external pressure caused by hose clamps or other fastening
devices (see 4.5.2).
3.4.4 Flanged joints. Flange joints shall have smooth faces suitable for use with gaskets,
and when assembled shall provide airtight joints under all conditions of service. There shall be
no holes in flanges opening into the clean-air passage (see 4.5.2).
3.4.5 Servicing. Servicing, cleaning, and reassembly shall be accomplished without the
use of special tools and without disturbing the clean air connections to the engine. The number
of parts required to be removed for servicing shall be held to a minimum and shall be so
designed as to prevent improper reassembl y (see 4.5.2).
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3.4.6 Air leakage resistance. The air cleaner shall not leak more than 0.5 m /hr
[0.3 cubic feet per minute (cfm)] at a vacuum of 12.5 kilopascals (kPa) [50 inches of water] and
show no evidence of internal or external physical damage (see 4.5.3.1).
3.4.7 Air flow restriction. The initial airflow restriction of the air cleaners shall not
exceed 2.2 kPa (9 inch of water) at rated airflow (see 4.5.3.2).
3.4.8 Post service airflow restriction. Unless otherwise specified by the procuring
activity/acquisition document (see 6.2), the air cleaner shall not exceed its original restriction by
more than 249 pascals (Pa) [1 inch of water] at rated airflow after servicing (cleaning) (see
4.5.3.5).
3.4.9 Efficiency. The efficiency of the air cleaner at rated airflow shall be not less than
99.5% after being fed fine grade dust for 30 minutes or until 110 grams of dust has been fed,
whichever results in a greater quantity of dust, or 60 minutes if the rated airflow face velocity of
the filter clement media is 183 cm per minute (6 feet per minute) or less (see 4.5.3.3).
3.4.10 Service life. After being subjected to the requirement of 3.4.7 the air cleaner
shall be capable of operation to 20 hours to reach an airflow restriction of 5.0 kPa (20 inch of
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