DayZ field wiki · Gear
Gas mask
Filter, then the fog
Short answer
A mask without a filter is a costume. NBC is a full idea. Walk around if a piece is missing.
Also: gasmask · filter · respirator
How it works
Gas masks need a working filter. Filters die. Exact minutes stay empty.
What to do
Dress before the yellow. Watch the filter like a mag.
Don't
Don't treat a paintball mask as NBC.