M2A2 AIR PURI FI ER UNIT: Removes all known chemical agents from the air. The air purifier can produce a flow of 12
cubic feet (0.34 cubic meters) of breathable air per minute. The pure air is then supplied to up to four crew members
through hosing to four air outlet orifices and individual M25A1 face pieces. The air purifier unit consists of an M13
particulate filter, an M1 2A1 gas filter, and an MiA1 air purifier precleaner in a steel housing.
AIR OUTLET ORIFICES: Provide stowage locations for hoses that connect to canisters on M25A1 face pieces. Three
orifices are located in the crew compartment, and one is located in the drivers compartment.
AIR PURIFIER CONTROL BOX: Contains ON/OFF switch for operation of the VFPS.
M3 HEATERS: Warm the air before it reaches the face pieces. A heater is connected in-line to each M25A1 face piece.
Each heater is individually temperature-adjusted and switched (OFF/ON). Heaters must be turned on when operating the
VFPS in outside temperatures of less than 40°F (4.40C).