MIL-PRF-62048C
3.4 Performance characteristics. Unless otherwise specified herein, the air cleaner shall
meet the performance requirements specified below when a filter element conforming to
MIL-PRF-46736 has been installed in the air cleaner. The filter element and air cleaner housing
is referred to herein as "air cleaner assembly." The air cleaner housing and assembled
components are referred to herein as "air cleaner housing." Unless otherwise specified herein,
performance requirements shall be met with a clean new element (see 6.2) under the following
conditions:
21.2 to 32.2 degrees Celsius (°C) [70 to 89 degrees
a.Temperature
Fahrenheit (°F)].
30 to 65 percent (%).
b. Relative humidity -
- The rated airflow shall be as specified in the applicable
c. Air flow
drawing or MS standard, and variable airflow shall be as
specified in figure 1. Specified values of airflow are for
standard atmospheric conditions of 249 pascals (Pa)
barometric pressure and 12.4°C (80°F) ambient
temperature providing an air density of 1.17 kilograms
per cubic meter
Actual airflow values during
testing shall be corrected to standard conditions and
shall be within plus or minus two percent of specified
values.
- Unless otherwise specified by the procuring
d. Airflow restriction
activity/acquisition document (see 6.2), actual airflow
restriction values shall be corrected to airflow with a
density of 1.17
and shall be accurate to plus or
minus 24.9 Pa (0.1 inch of water).
- The test dust shall be of two grades labeled fine and
e. Test dust
coarse. The chemical analysis of test dust shall be as
specified in SAE J276. The particle size distribution by
volume and/or weight for the two grades shall as
specified in SAE J726.
- When the feeding of dust is required as part of any test,
f. Dust feeding rate
the dust shall be fed at an average rate of 0.883 gram per
(0.025 gram per cubic foot) for the
cubic meters
actual airflow. See figure 1 for percentage of rated
airflow variations. The dust rate shall not vary more
than 0.177 g/m3 (0.005 gram per cubic foot) during
any part of applicable test
g. Scavenge airflow rate - The scavenge airflow rate shall be as specified in
Appendix paragraph A.3.5. Air cleaners equipped with
scavenge air aspirators or similar types (non-electric
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