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TM 9-2320-364-10
2-39
Figure 2-18. Gas Particulate Filter Unit (GPFU) Kit
Key
Control or Indicator
Function
1
Gas Particulate Filter Unit
(GPFU)
Filters nuclear, biological and chemical
(NBC) contaminants from the air.
2
M-3 Heater
Warms the air entering protective mask.
3
M-3 Heater Control Knob
Turn CW for warmer air. Turn CCW for
cooler air. Turn to OFF to shut off heater.
4
M-3 Heater Indicator Light
Lights when the heater is operating.
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