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3.5
Respirator Fit Test
A qualitative or quantitative fit test must be conducted for each wearer of the respirator to determine the amount of
protection it will provide. Respirator fit tests are explained fully in the Standard Practices for Respiratory Protection, ASTM
F3387.
Quantitative Test
If a quantitative fit test is used, a fit factor that is at least 1,000 shall be obtained before that respirator is assigned to an
individual.
Qualitative Test
If a qualitative fit test is used, only validated protocols are acceptable. The individual must pass a test designed to assess a
fit factor of at least 1,000.
Respirators must be qualitatively or quantitatively fit tested in a negative-pressure mode.
WARNING!
The user must perform a respirator fit test and follow all warnings and limitations specified.
Failure to follow this warning can result in serious personal injury or death.
NOTE: The user assumes all risks of death or serious bodily injury which may result if a fit test is not performed, or the
respirator limitations are not followed.
3.6
Facepiece Fit Check
WARNING!
• If the facepiece does not pass a negative pressure leak test, remove the facepiece from service and return it to an
MSA trained and certified repair technician.
• Perform a negative pressure leak test before each use and before going into a toxic atmosphere.
Failure to follow this warning can result in serious personal injury or death.
US
3. Pull the head straps over your head.
a. Ensure that the harness is sitting correctly and is not twisted.
4. Adjust facepiece and tighten the straps firmly and evenly.
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