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MIL-V-85830(AS)
4,8,4,2 Low temperature.  The ventilator shall be tested as specified in
MIL-STD-81O, Method 502.2, Procedure II, Operation. The ventilator shall be
placed in a climatic chamber.  The chamber temperature shall be lowered to
-40F at a rate of 5F per minute.  The chamber temperature shall be
maintained at that temperature for a period of one hour.  The temperature
shall then be brought to -14F at a rate of 5F per minute and maintained for
a period of SIX hours.
External power shall be connected at the external
connector.  The motor switch shall be selected to the "ON" position. The
ventilator shall meet the requirements specified In 3.9.10 and 3.9.10.2.
4.8.4.3 Salt fog.  The ventilator shall be tested as specified in
MIL-STD-81O, Method 509.2.  The test shall consist of four alternating periods
of 24 hours exposure and 24 hours drying time.  The ventilator shall be placed
in the test chamber with the filter canister(s) assembled. At the conclusion
of the test the ventilator shall be examined for corrosion and deterioration
of metal parts, finishes, materials and components.  The ventilator shall meet
the requirements specified in 3.9.10 and 3.9.10.3.
4.8.4.4 Rain.  The ventilator shall be subjected to the rain test as
specified in MIL-STD-81O, Method 506.2, Procedure I, Blowing Rain, for a
period of one hour.  The rainfall rate shall be four Inches per hour. During
the test the ventilator shall be operating. The ventilator shall meet the
requirements specified in 3.9.10 and 3.9.10.4.
4.8.4.5 Fungus.  The ventilator shall be tested as specified in
MIL-STD-810, Method 508.3 for a period of 28 days.  The ventilator shall be
placed in the test chamber without filter canisters. The ventilator shall
meet the requirements specified in 3.9.10 and 3.9.10.5.
4.8.4.6 Low pressure and high humidity.  The ventilator shall be subjected
to the low pressure test as specified in MIL-STD-81O, Method 500.2, Procedure
II, Operation.  The ventilator shall be placed in the climatic chamber with
the motor switch in the `ON' position.  Air outlet pressure at an air flow of
2.7 .2 cfm shall be recorded throughout the test. The chamber temperature
shall be reduced to -14F at a rate not exceeding 5F per minute and the
condition maintained for a period of 30 minutes.  The pressure in the chamber
shall then be reduced to .7 standard atmospheres over a period of 15 minutes
and maintained at this pressure for 30 minutes.  The chamber humidity shall
then be raised and maintained at or close to saturation, while both the
chamber temperature is raised to 32F and the pressure increased to NTP
pressure at an approximately linear rate over a period of 15 minutes. The
chamber temperature shall then be raised at an approximate linear rate to 86F
with the humidity maintained at or near saturation over a period of 30
minutes.  The chamber conditions shall be maintained for a period of not less
than one hour and until  all frost has melted.  The ventilator shall meet the
requirements specified in 3.9.10 and 3.9.10.6.
4.8.4.7 Dust.  The ventilator shall be subjected to the dust test as
specified in MIL-STD-8 O, Method 510.2, Procedure I, Blowing Dust, for a
period of six hours at 73F and 300 ft./rein. air velocity and six hours at
131F and 1750 ft./rein air velocity.  The relative humidity shall not be
greater than 30 percent.  During the dust testing the ventilator shall be
Air outlet pressure at the outlet of the air supply hose at an air
operating.
flow of 2.7 .2 cfm shall be recorded throughout the test. The ventilator
shall meet the requirements specified In 3.9.10 and 3.9.10.7.
17

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