What's The Difference Between N95 and KN95 Masks? - Smart …
Most of these differences are small and would be uninteresting to the average mask user. However, here are the key differences: 1. To be certified as a KN95 mask, the Chinese government requires the manufacturer to run a special mask fit test on real humans with ≤ 8% leakage. The N95 mask standard does not require manufacturers to run fit tests.