TM 9--2350--292--100005 00--12THEORY OF OPERATION -- CONTINUED0005 00AIR PURIFICATION SYSTEMDAIRPURIFICATIONUNITSwitch (1) -- located on the front wall of the crew compartment, turns the gasparticulate filter units (2) ON or OFF and supplies power to the M3 heaters.DGasParticulateFilterUnit (2) -- supplies filtered air through hoses through the M3 heaters to NBCmasks worn by crewmembers. Four NBC hoses can be attached to each gas particulate filter unit.DM3Heaters (3) -- warms air from gas particulate filter unit (2) before entering protective mask.FORWARD213
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