KN95 vs. N95
KN95 is a Chinese standards designation similar to N95 (U.S. - NIOSH-42C FR84), FFP2 (European – EN149-2001), P2 (Australia & New Zealand – AS/NZ 1716:2012), and KF94 (Korea – KMOEL-2017-64). They are similar mainly for the Filter or Filtration Efficiency ratings of 95%+ (KN95) and 94%+ (others). However, they differ in terms of “Total Inward Leakage” (eg Air & particle leakage INTO the mask due to facial fit, breathing, and movements).
The non-NIOSH N95 standards (KN95, FFP2, P2 & KF94) allow for 0-8% Total Inward Leakage. The Total Inward Leakage is not part of the NIOSH certification standards; however, most of the 3M's N95 masks achieve less than 1% Total Inward Leakage due to their double-headband, tight-fitting designs and therefore suitable for extremely high-risk environment such as hospitals.