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2. Respirator fit test - Wikipedia

   en.wikipedia.org/wiki/Respirator_fit_test

   Fit test in US Navy. The effectiveness of various types of respirators was measured in laboratories and in the workplace. [3] These measurements showed that in practice, the effectiveness of negative pressure tight fitting respiratory protective devices (RPD) depends on leakage between mask and face, rather than the filters/canisters. [4]

3. European respirator standards - Wikipedia

   en.wikipedia.org/wiki/European_respirator_standards

   The protection provided by an FFP2 (or FFP3) mask includes the protection provided by a mask of the lower-numbered classes. A mask conforming to the standard must have its class written on it, along with the name of the standard and its year of publication, as well as any applicable option codes, e.g. “EN 149:2001 FFP1 NR D”.

4. NIOSH air filtration rating - Wikipedia

   en.wikipedia.org/wiki/NIOSH_air_filtration_rating

   During the COVID-19 pandemic, the mask and respirator market rapidly grew, along with counterfeit respirators. [1] NIOSH, on behalf of the Department of Health and Human Services, filed a trademark application on June 17, 2020, for various 42 CFR 84 trademarks, including the N95, allowing NIOSH to enforce rules on counterfeit masks outside of rules defined in 42 CFR 84.

5. Respirator assigned protection factors - Wikipedia

   en.wikipedia.org/wiki/Respirator_Assigned...

   At the beginning, it was thought that the half-mask fit quite well to the worker's face, if during a fit test the protection factor (fit factor) is not less than 10 (later, experts began to use "safety factor" = 10 during the fit test; threshold fit factor become 10 × 10 = 100). The widespread use of fit testing in the industry gives ...

6. Personal protective equipment - Wikipedia

   en.wikipedia.org/wiki/Personal_protective_equipment

   Equipment for use in preventing spread of disease, such as by exposure to infected individuals or contamination or infection by infectious material (including nitrile and vinyl gloves, surgical masks, respirator masks and powered air purifying respirators and required filters, face shields and protective eyewear, surgical and isolation gowns ...

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8. Respirator - Wikipedia

   en.wikipedia.org/wiki/Respirator

   A surgical mask may not block all particles, due to the lack of fit between the surface of the face mask and the face. [46] The filtration efficiency of a surgical mask ranges between 10% and 90% for any given manufacturer, when measured using tests required for NIOSH certification.

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