MIL---DTL---52011(EA)
3.3 Resistance to airflow. The resistance to airflow shall be no greater than 0.8 inch of water
gage (iwg) at an airflow rate of 12 standard cubic feet per minute (scfm) when tested as specified
in 4.4.1.
3.4 Filtration efficiency. The filters shall be no less than 99.97% efficient in the removal of
aerosols with a mean diameter of 0.3 microns when tested in accordance with 4.4.2.
3.5 Air leakage. Air leakage shall be not greater than 0.91 cubic inch per minute when the
filter is internally pressurized to a pressure of not less than 12 inches of water when tested as spe-
cified in 4.4.2.
3.6 Resistance to rough handling. The filters shall meet the requirements of 3.3, 3.4, and 3.5
after rough handling for 15 minutes at an amplitude of 3/4 inch with the filter face, pleats, and
separators in a vertical position, when tested as specified in 4.4.4.
3.7 First article. When specified (see 6.2), a sample shall be subjected to the first article in-
spection in accordance with 4.2.
3.8 Workmanship. The particulate filter shall be free from chipped, burred, or bent metal
sections; foreign matter, such as oily or viscous substances; and rips, tears, or holes in the filtering
medium.
4. VERIFICATION
4.1 Classification of inspections. The inspection requirements specified herein are classified
as follows:
(a) First article inspection (see 4.2)
(b) Conformance inspection (see 4.3)
4.2 First article inspection.
4.2.1 Sample. The first article sample shall consist of 10 particulate filters manufactured prior
to the start of regular production and using the same methods, materials, equipment, and pro-
cesses as will be used during regular production. The first article sample shall be submitted for
inspection and approval in accordance with the terms of the contract.
4.2.2 Inspections to be performed. As determined by the Government, the sample first article
items may be subjected to any or all of the examinations and tests specified in this specification
and be inspected for compliance with any or all of the requirements of the applicable drawings.
4.2.3 Acceptance criteria. If any first article sample item fails to comply with any of the appli-
cable requirements, the first article sample shall be rejected. The Government reserves the right
to terminate inspection upon any failure to comply with any of the requirements. The contractor
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