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An N95 respirator is a disposable filtering facepiece respirator or reusable elastomeric respirator filter that meets the U.S. National Institute for Occupational Safety and Health (NIOSH) N95 standard of air filtration, filtering at least 95% of airborne particles that have a mass median aerodynamic diameter of 0.3 micrometers under 42 CFR 84, effective July 10, 1995.
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.
Some jurisdictions allow for respirator filtration ratings lower than 95%, respirators which are not rated to prevent respiratory infection, asbestos, or other dangerous occupational hazards. These respirators are sometimes known as dust masks for their almost exclusive approval only against dust nuisances:
NIOSH particulate respirator class minimum efficiency levels [19] Particulate Respirator class Minimum efficiency level Permitted for TB Permitted for asbestos; NaCl (N) or DOP (R,P) N95, R95, P95 95% Yes No N99, R99, P99 99% N100, R100, P100 99.97% Yes
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1.1. The air purifuing respirators (negative pressure; and powered PAPR) - with high efficiency filters (>99.95%); 1.2. The supplied air respirators - with positive pressure demand air supply to the masks; and with continuous flow air supply to the helmets or hoods. 2 The APF for South Korea and RF are not mandatory, but recommended values only.
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