MIL---DTL---52011(EA)
metal plates, opening the air flow control valve, and adjusting the flow until a pressure of at least
12 inches of water is established within the filter. The flow rate that is required to maintain this
pressure is the air leakage value. The filter will be determined to be defective if the air leakage
value exceeds 0.91 cubic inches per minute.
4.4.3 Filtration efficiency. The test apparatus used to measure the filtration efficiency shall be
capable of maintaining a stable concentration of aerosol with a mean particle size of 0.3 microns
with a steady flow through the filter of 12 scfm. The test apparatus shall have the capability to
determine the concentration of aerosol both upstream and down stream of the filter within
0.005%. The downstream sample point shall be located such that changing of its location across
the ductwork does not cause a significant change in the measured concentrations. This shall be
verified using a filter with a known measurable leak. The filter shall be placed in the test appara-
tus such that the flow of air containing the challenge aerosol is in the direction indicated by the
marking on the filter, and the flow of aerosolized air shall be maintained at 12 + 3 scfm. This flow
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shall be maintained for not less than 1 minute or more than 2 minutes. The filter shall be rejected
if the downstream concentration exceeds 0.03 percent of the upstream concentration which indi-
cates that the filtration efficiency is less than 99.97 percent. (See note 6.5)
4.4.4 Resistance to rough handling. The filters shall be rough handled in accordance with
Method T105.10 of MIL --- STD --- 282, and then tested for resistance to airflow, air leakage, and
filtration efficiency in accordance with 4.4.1, 4.4.2, and 4.4.3 respectively.
5. PACKAGING
5.1 Packaging. For acquisition purposes, the packaging requirements shall be as specified in
the contract or order (see 6.2). When actual packaging of materiel is to be performed by DoD
personnel, these personnel need to contact the responsible packaging activity to ascertain requi-
site packaging requirements. Packaging requirements are maintained by the Inventory Control
Point's packaging activity within the Military Department or Defense Agency, or within the Mili-
tary Department's System Command. Packaging data retrieval is available from the managing
Military Department's or Defense Agency's automated packaging files, CD --- ROM products, or
by contacting the responsible packaging activity.
6. NOTES
(This section contains information of a general or explanatory nature that may be helpful, but
is not mandatory.)
6.1 Intended use. The particulate filter covered by this specification is intended to be used in
an air purifier.
6.2 Acquisition requirements. Acquisition documents must specify the following:
(a) Title, number, and date of this specification
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