Some key concepts to understand are:
- No single respirator model fits every face. It is likely that multiple respirator models will be needed in order to achieve a good fit on every single face in a large population of wearers.
- Every wearer population may yield different respirator fit test pass rates. Fit test pass rates for any given respirator model will vary depending on population demographics, such as gender distribution, ethnicity, and age, and on the fit test methodology used.
- Because each face is different and each worker group is different, every fit testing session may yield a different pass rate.
- 3M recommends fit testing each individual on any respirator model they will wear.
- In occupational settings, fit testers may need to deliver some training to the person being fit tested.
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