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  • Air-purifying respirators designed to prevent the wearer from inhaling airborne particulates, including dusts, mists, fumes, and some bacteria (e.g., Mycobacterium tuberculosis). These respirators typically consist of a filtering facepiece (e.g., mask) of multilayer filter material. Disposable respirators or the filters in reusable units should be replaced when breathing becomes difficult. Particulate air-purifying respirators do not protect against inhalation of gases and vapors.
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