For a proper fit of a protective mask, you should take a Fit test. If the mask fits properly it will not allow air from the outside into the facepiece no matter the position of the head.
cover your intake valves with the palm of your hands and inhale you should feel the mask suck down onto your face
you perform the negative pressure check and the lens remains deflected after holding your breath if you are unsure you do have not the proper fit of the pro mask after you clear and seal it...use the pats test on it
You perform the negative pressure check and the lens remains deflected after holding your breath. Put your hands over the air inlets (the M17 mask has two; other masks have only one) so no air can get in, and inhale really hard. If the mask collapses to your face, and it doesn't leak air, you have achieved a proper fit.
Drop to the ground, don protective mask (if not donned already)
Upon issue of your protective mask, you should clean and inspect your mask IAW with the M50 mask and T.O. and as directed
Upon issue of your protective mask, you should clean and inspect your mask IAW with the M50 mask and T.O. and as directed
the difficulty of drinking in the protective mask
two
You perform a negative pressure check and the lense remains deflected
By the front of the facepiece
Turn in mask