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Message: <blockquote data-quote="Umbran" data-source="post: 8504009" data-attributes="member: 177">There are some small differences.  Both are designed to filter out 95% of 0.3 micron particles, and for most people's use, they are equivalent.1) The KN95 requires a fit test as part of the certification, meaning they have to put it on an human being, and demonstrate it has <8% leakage.  The N95 does not make this fit test part of the standard.2) The N95 has slightly stricter standards for pressure drop across the mask when inhaling and exhaling, so you might find an N95 more breathable.3) The real practical issue is that there's TONS of counterfeit KN95s on the market, while there are few counterfeit N95s.  KN95s are usually cheaper than N95s.</blockquote>