3M Combination Filter CF32 ABEK2HgP3 R D DT-4046E, 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 organic and inorganic gases and vapours, as well as acid gases and vapours, Protects against mercury, ammonia, and organic ammonia derivatives, Protects against many kinds of particles, micro-organisms, and enzymes, A2 classification when used in negative pressure mode, A1 classification when used with approved powered air systems EN 14387:2004+A1:2008.