An<unk>  for industrial use Surgical<unk> s for use in health care are both approved by NIOSH (as a<unk>  and cleared by FDA (as a fluid-resistant surgical mask) An<unk>  filtering facepiece<unk> , commonly abbreviated<unk> , is a particulate-filtering facepiece<unk>  that meets the U.S. National Institute for Occupational Safety and Health (NIOSH)<unk>  classification of air filtration, meaning that it filters at least 95% of airborne particles. This standard does not require that the<unk>  be resistant to oil; another standard, P95, adds that requirement. The<unk>  type is the most common particulate-filtering facepiece<unk> . It is an example of a mechanical filter<unk> , which provides protection against particulates but not against gases or vapors. An authentic<unk>  is marked with the text "NIOSH" or the NIOSH logo, the filter class ("N95"), a "TC" approval number of the form XXX-XXXX, the approval number must be listed on the NIOSH Certified Equipment List (CEL) or the NIOSH Trusted-Source page, and it must have headbands instead of ear loops. The<unk>  mask filter was invented by Taiwanese-American Peter Tsai and his team, and received its U.S. patent in 1995.<unk> s are considered similar to other<unk> s regulated under non-U.S. jurisdictions, but slightly different criteria are used to certify their performance, such as the filter efficiency, test agent and flow rate, and permissible pressure drop. For example, FFP2<unk> s of the European Union are required to meet at least 94% filtration, and<unk> s of China are expected to meet at least 95% filtration. However, NIOSH found that some products labeled as "KN95" failed to meet these standards, some of them filtering out as little as one percent. Both the U.S. Food and Drug Administration and Health Canada require such KN95 products failing to meet the filtration standards to be re-labeled as "face masks" instead of<unk> s", when being sold in the U.S. and Canada. The<unk>  requires a fine mesh of synthetic polymer fibers, specifically a nonwoven polypropylene fabric. It is produced by melt blowing and forms the inner filtration layer that filters out hazardous particles.
N95 respirator
Venturi mask
Gas mask
Oxygen mask
Oxygen tent
Nasal cannula
Pocket mask
Elastomeric respirator