MIL-PRF-16552F
6.7.1 Air filter. The air filter consists of a filtering media
enclosed in a frame or binding channel, media retaining guards, and handles.
6.7.2 Face area. The face area of a filter is the area, in square
feet, obtained by multiplying the inside dimensions of the face of the filter
frame or binding channel.
6.7.3 Face velocity. The face velocity of a stream of air passing
through a filter, expressed in feet per minute, is the rate of flow of air
measured in cubic feet per minute divided by the face area of the filter.
6.7.4 Dust load. Dust holding capacity is the amount of synthetic dust
fed to the test filter times its average arrestance when the test filter
reaches the rated final resistance.
6.7.5 Arrestance. Arrestance is an efficiency value. A standardized
dust consisting of various particle sizes is fed into an air cleaner and the
weight fraction of dust removed is determined. Under ASHRAE 52.1-1992, this
type of efficiency measurement is named synthetic dust weight arrestance to
distinguish it from other efficiency values.
6.7.6 Resistance (to air flow). Resistance is the static pressure drop
across the filter at a given air flow rate. The term "pressure drop" is used
interchangeably with resistance.
6.8
Recommended practices. The following documents provide
information for the design, manufacture, testing, and qualification of
vaneaxial fans used for cooling of gas turbine machinery previously supplied
to the United States Navy, and may be used for guidance:
a. MIL-F-16552 Filters, Air Environmental Control System, Cleanable,
Impingement (High Velocity Type)
b. NAVSHIPS Drawing 804-1170895
Filters, Air, Navy Standard
c. MIL-STD-889 Dissimilar Metals
6.9
Subject term (key word) listing.
Air filters
Air filters, nonmagnetic
6.10 Changes from previous issue. Marginal notations are not used in
this revision to identify changes with respect to the previous issue due to
the extensiveness of the changes.
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