A Quantitative Fit Test for Dust/Mist Respirators: Part II

Abstract

Abstract Fit testing is an important aspect of any respiratory protection program. In the past, the only accepted method of fit testing respirators equipped with dust/mist filters was the saccharin qualitative fit test. Traditional quantitative fit testing requires respirators to be equipped with high-efficiency filters because of the small particle size used. Dust/mist respirators, including disposable models, can now be quantitatively fit tested without filter modification. This is possible through the use of a challenge aerosol having particles large enough that they do not significantly penetrate filter media, but small enough to penetrate face seal leaks. Consequently, detection of particles that enter the respirator cavity provides a quantitative indication of face seal leakage. The purpose of this article is to compare results from saccharin qualitative fit testing with results from the new, large-particle, quantitative fit test. The study evaluated four commercially available National Institute for Occupational Safety and Health/Mine Safety and Health Administration-approved dust/mist respirators. The results verify the importance of fit testing in general and demonstrate that the large-particle, quantitative face fit test and the saccharin qualitative fit test are both effective methods for fit testing dust/mist respirators.