NBC Mask
From Serenity : The Wiki
This is a fancy gas mask that lets you breath safely in any area contaminated by nuclear, biological, or chemical contaminants. Unfortunately the Mask provides very limited visibility and it doesn't protect the rest of your body from any hazards. Still it's a quick, cheap and easy way to provide some protection from airborne contaminants. The NBC in the name stands for 'Nuclear, Biological, and Chemical'.
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See also: NBC Body Suit
