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42 cfr 84, nfpa 1981, ansi z88.7-2001, 21 cfr 878.4040, en 143, en 149, en 137, en 14387 [ edit on Wikidata ] A respirator is a device designed to protect the wearer from inhaling hazardous atmospheres including lead fumes , vapors , gases and particulate matter such as dusts and airborne pathogens such as viruses .