The Sensidyne Air Flow Indicator (HVAC) Kit is highly recommended to track air flow currents and for fit testing respirators per OSHA 29 CFR part 1910.134, irritant fume protocol.  The human response to irritant smoke is involuntary.  The irritant smoke qualitative fit test is a fit check that doesn't rely on the subjective response of the person tested.  Kit uses rubber bulb. P100 filters for testing. 

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