Respirator Qualitative and Quantitative Fit Testing
Fit testing is required for tight-fitting facepiece respirators. Users may test the effectiveness of the fit of the facepiece using two methods: qualitative or quantitative.
Qualitative fit testing (QLFT) introduces a harmless substance (with odor) or an irritating substance close to a respirator while it is being worn. If the user does not detect an odor or irritation, then the piece is considered to have a proper fit.
Quantitative fit testing (QNFT) is more precise than qualitative testing. An instrument numerically measures any leakage of an aerosol that is introduced near the respirator.
Appendix A of the OSHA respiratory protection standard provides detailed instructions for performing general, qualitative, and quantitative fit testing.
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