1-16. EQUIPMENT OPERATION (continued).
NBC VENTILATED FACE PIECE SYSTEM
The ventilated face piece system (VFPS) provides clean, filtered air for the crew and personnel under NBC situations.
The system includes one air precleaned/particulate filter unit with four filtered air outlets, four M3 air heater, four outlet
connectors, and one NBC power control box.
The air precleaned/particulate filter is located in the lower left rear of the crew compartment. Three air heaters are
mounted forward from the precleaned. One air heater is located in the drivers compartment. The NBC control box
is located on the left side of the crew compartment ceiling and is controlled by the user.
When not in use, hoses are connected to outlet connectors that function as one-way valves, allowing system air to
escape and preventing backflow. When in use, the hoses are disconnected from outlet connectors and are connected
to canister packs on face masks used with the system.
Each filtered air outled has an M3 air heater connected in-line to allow air temperature to be individually controlled by