26
Donning
G1 Air-Purifying Respirator (APR)
US
7.3
Testing the Negative Pressure Seal
WARNING!
If the facepiece does not hold a negative pressure seal, remove the respirator from service and
return it to an MSA trained repair technician.
Do a negative pressure seal test before each use and before going into a toxic atmosphere.
Failure to obey these warnings can result in serious personal injury or death.
To make sure that the face-to-facepiece tightness is correct, do a negative pressure seal test before
each use.
7.3.1 Single Port
(1) Use the palm of your hand to seal the inlet to the air
filtration cartridge(s)/canister.
(2) Inhale and hold your breath for 10 seconds. Make
sure that the facepiece stays collapsed on your face.
(3) Exhale. Make sure that the exhalation valve opens
and the pressure inside the facepiece is released.
(4) If necessary, retighten the straps.
