Protects against non-toxic dust, powders, and aerosol particles. Meets European Standard EN 149:2001 with following classes. FFP2: Minimum 94% filtration percentage and maximum 8% leakage to the inside. Mainly used for variety of industry including healthcare against influenza viruses, SARS, new coronavirus etc. FFP3: Minimum 99% filtration percentage and maximum 2% leakage to the inside. The finest filtering mask of the FFPs.