The N95 or N95 respirator is a filter that tests filters that meet the U.S. National Institute for Occupational Safety and Health (NIOSH) N95 with air filtering categories, meaning it filters at least 95% of particles into the air. This level does not require the respirator to be oil resistant; another level, P95, adds to that need. The N95 type is the most common particulate-filtering facepiece. It is an example of a filter respirator, which provides protection from particles but not from gases or crevices.
N95 respirators are considered to be equivalent to certain air-conditioned regulators under non-U.S. authorities, such as the European Union’s FFP2 respirators and China’s KN95 respirators. However, slightly different conditions are used to ensure its effectiveness, such as filter performance, test agent and flow rate, and allowable pressure reduction.
The N95 mask requires a fine fiber of synthetic polymer fibers, especially non-woven polypropylene fabric. It is produced by the melting of air and forms an internal filter that filters out harmful particles.