TM 9-2350-287-10OPERATING AUXILIARY EQUIPMENT (continued)Ventilated Face Piece System (VFPS)Air purifier unit filters must be kept dry. Filters which have been wet will not provide protection from NBCcontaminants.• If temperature Is less than 40°F (4.4°C) outside, there is danger of lung damage from inhaling cold air.DO NOT connect hose to your mask canister until filter unit has been operating for at least 15 minuteswith heater turned on.• Do not try to change filters yourself. If they are contaminated, special safety precautions must be taken.• After suspected NBC exposure, all air filter media shall be handled only by personnel wearing full NBCprotective equipment.2-200
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