The OSHA Respiratory Protection Standard 29CFR1910.134 requires a 15-second grimace exercise. Why is the data from that exercise ignored when the overall fit factor calculation is made?
The purpose of the grimace exercise is to intentionally break the face seal. The fit factor measured during the grimace is irrelevant. What is important is the next exercise. If the respirator reseats itself like it should, the next exercise will get a passing fit factor. If the data from the grimace exercise were to count, people could fail the fit test even though they have a good-fitting respirator. TSI fit testing software allows the data from the grimace exercise to be “excluded” from the overall fit factor calculation. This cannot be done when the PORTACOUNT is used without software. The grimace exercise is not part of qualitative fit test protocols because breaking the face seal will always cause the test to fail. • We always use a clean mask for each fit test to avoid spreading germs from person to person, but what about the moisture that collects in the PORTACOUNT sample tube. Can someone be exposed to moisture from a previous test subject? TSI has tested the PORTACOUNT and de
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- The OSHA Respiratory Protection Standard 29CFR1910.134 requires a 15-second grimace exercise. Why is the data from that exercise ignored when the overall fit factor calculation is made?
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