MIL-PRF-32001
the unit.
4.3.2 Internal power system inspection. Inspect and verify that the internal power system
does not contain moving parts. Operate unit to verify that the power system does not require
adjustments for proper performance or produce noise during operation. Verify that the internal
power system does not require recharging, refueling or replacement. Verify during operation that
there is no external power source used to operate the fan unit.
4.3.3 Air flow test. For the purpose of testing, the "standard test setup" shall refer to a fan
unit installed in the setup shown in Figure 2. Unless otherwise specified, all air flow tests shall be
conducted in surrounding ambient temperatures of 68 F (+/- 3 F). The setup shall consist of an
electric hot plate, a test base, the fan unit, and a top shroud, along with a thermocouple and air
velocity transducer. The hot plate shall be a McMaster-Carr Model 3118K88 (see 6.8) or
equivalent commercially available, 1500 Watt electric heater. The heating element of the hot plate
shall be 8 inches in diameter. The overall size of the hot plate unit shall be a minimum of 15
inches square by 4 to 8 inches high. The test base shall be an 8 inch diameter by 0.5 inch thick
aluminum disk as shown in Figure 3. It shall contain a 0.125 inch diameter hole drilled from the
outer diameter to the center of the disk, with the drill hole centered between, and parallel to, the
faces of the disk. A thermocouple and heat sink compound shall be inserted into the hole. The
thermocouple shall be connected to a thermocouple reader. The test base shall be placed over the
electric hot plate heating element. The fan unit shall be placed in the approximate center of the
test base. The top shroud shall be 14 inches tall and have an inner diameter equal to the outer
diameter of the fan unit. The shroud shall have two, 0.25 inch diameter holes, 90 degrees apart
and 7 inches down from the top of the unit. The air velocity transducer shall be an Omega model
FMA-900 or equivalent (see 6.8) containing a 0.25 inch diameter probe with sufficient length to
insert into the center of the shroud.
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