3M Combination Filter CF22 A2B2E1P3 R D DT-4036E, Suitable for use with certain 3M half and full-face tight-fitting respirators in negative-pressure mode, as well as 3M Powered Air Respirator System PF-600 Series, Protects against particulates, organic and inorganic gases, and vapours. Protects against gases and vapours with a boiling point above 65C, Protects against inorganic gases and vapours, and acid gases and vapours, Protects against a range of particulates: Solid and liquid particles Toxic and radioactive particles Micro-organisms (e.g. bacteria and viruses) Enzymes, A2 classification when used in negative pressure mode, A1 classification when used with approved powered air systems EN 14387:2004+A1:2008.