Is buying KN95 masks worthwhile? - Arozk Official Blog- kn95 หน้ากากซื้อ uk ,May 20, 2020·And the KN95, FFP2 and KF94 mask is as effective as NIOSH-certified N95 mask with the same filtration efficiency, but are tested by different nation criteria. The KN95 respirator is a particulate-filtering mask tested using the China criteria. The FFP2 is a filtering facepiece score of 94% filter capacity approved by Europe, and the KF94 is ...

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