MIL-PRF-62048 Air Cleaners, Automotive: Heavy Duty, Dry-Type \(For Internal Combustion Engines\) \(Metric\)This specification covers heavy duty, dry-type, air cleaners with a replacement filter element for use with internal combustion engines fox mobile applications.

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MIL-PRF-62048C

4.5.3.3 Efficiency. To determine conformance to 3.4.9, the air cleaner shall be set up in

accordance with figures 2 or 3, and the air. adjusted to rated flow. Feed fine dust at

0.883 0.176 grams per cubic meter

(0.025 grams per cubic foot) air for 30 minutes. In

air cleaners where the rated airflow face velocity through the filter element media is 183 cm

(6 feet) 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 recorded. The master filter and

conductors shall be removed from the test setup taking care to retain all the entrapped dust, and

reweighed. Weighings shall be accurate to 0.01 gram wherever possible but never less accurate

than 0.1 gram. The efficiency shall be computed using the following formula:

Dust Efficiency (%) =

Where:

= Weight of dust fed.

= Weight of master filter and entrapped dust.

= Weight of master filter before test