KN95 non-medical face mask. A KN95 respirator is a respiratory protective device designed to achieve a very close facial fit and very efficient filtration of airborne particles. Face masks known as N95 and KN95 respirators are the common names for regulatory standards in different jurisdictions used to test their efficacy at filtering out at least 95% of very small particles. N95 is the standard name used in the U.S., KN95 refers to a standard name used in China.
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