OSHA requires positive-pressure respirators to be fit tested in negative-pressure mode. What do they mean?
Fit testing a positive-pressure respirator in negative-pressure mode is done in one of two ways. One way is to temporarily convert the mask to use HEPA filters instead of the usual air supply. Respirator manufacturers (and TSI) have special fit test adapters available specifically for this purpose. The other way is to share a permanently-probed, negative-pressure version of the same mask. Refer to Application Note ITI-024 Using the PORTACOUNT to Fit Test Positive-pressure Respirators.
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