The M40 Field Protective Mask is used by the United States Military and its Allies to protect from field concentrations of chemical and biological agents, along with radiological fallout particles. It is not effective in an oxygen deficient environment or against ammonia.

Characteristics

The M40 Field Protective mask features two voicemitters, one on either the right or left side, and one in front. A voicecom adapter may be placed over the front voicemitter to amplify the user's voice.

The C2 canister on the M40 mask can protect the user from up to 15 nerve, choking, and blister agent attacks, and two (2) blood agent attacks.

The M40 comes with a drinking system that allows the user to drink water when donning the mask for long periods of time in a chemically contaminated environment.