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Because you want an airtight seal
between your face and the respirator, you will need to fit test the respirator
each time you wear it to make sure no contaminant gets inside the facepiece
and into your lungs.
Positive Pressure Test
Begin by closing the respirator's exhalation valve by covering it with
your hand, then breathe out slowly. The facepiece will bulge out slightly.
Hold your breath for about 10 seconds. If during this time no air leaks
from around the facepiece, you know you have a good fit. If you do not
have a good fit, readjust the head harness straps, and repeat the pressure
test.
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