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  2. Respirator assigned protection factors - Wikipedia

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

    Fit testing of tight-fitting masks of negative-pressure respirators became widely used in US industry in 1980-s. 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 ...

  3. Respirator fit test - Wikipedia

    en.wikipedia.org/wiki/Respirator_fit_test

    The main advantage of qualitative fit test methods is the low cost of equipment, while their main drawback is their modest precision, and that they cannot be used to test tight-fitting respirators that are intended for use in atmospheres that exceed 10 PEL (due to the low sensitivity). To reduce the risk of choosing a respirator with poor fit ...

  4. NIOSH air filtration rating - Wikipedia

    en.wikipedia.org/wiki/NIOSH_air_filtration_rating

    NIOSH air filtration ratings do not test the fit of a respirator. Fit testing is required by OSHA for employers when a hazard is present, and voluntary respirator use under Appendix D is not allowed due to the hazard. [31] Rules for fit testing are also defined by ANSI Z88.2. Z88.2 notes that, in Canada, respirator care and fit testing are ...

  5. Self-contained breathing apparatus - Wikipedia

    en.wikipedia.org/wiki/Self-contained_breathing...

    42 CFR 84 replaces the 30 CFR 11 respirator regulation used by NIOSH. As of 2001, quality assurance of SCBA harnesses is required. As of 2001, quality assurance of SCBA harnesses is required. Labels have been updated to remove MSHA emblems from respirator labels, as MSHA is no longer involved in respirator approval except for respirators ...

  6. Elastomeric respirator - Wikipedia

    en.wikipedia.org/wiki/Elastomeric_respirator

    Limited research suggests that elastomeric respirators may have better fitting characteristics than disposable filtering-facepiece respirators, fitting a broader variety of faces, and thus being more likely to seal well when the user has not done a formal fit test. Available evidence also suggests that as a class, elastomeric respirators may ...

  7. Chemical cartridge - Wikipedia

    en.wikipedia.org/wiki/Chemical_cartridge

    This can also be a symptom of a loose fit the mask to one's face and the leakage of unfiltered air through the gaps between the mask and the face. Historically, this method is the oldest. Respirator cartridge (3M 6009) for protection against mercury vapor and chlorine.

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