A comparative study on sampling methods of disposable dust masks for fit tests (2)

The validity of the fit test using light-scattering based measuring devices under the JIS short protocol was evaluated for disposable masks using test guides that are widely used in Japan to assess the fit between mask facepieces and faces. The results, based on the ANSI criteria, indicated that both the test guides and disposable test guides provided evaluations equivalent to those of the probe attachments. Consequently, this study demonstrated that the test guides and disposable test guides are applicable fit tests. Both test guides concluded that strict evaluations of insertion leakage helped reduce false positives, making them reliable for worker protection.