1 Pair of 3M 60922 Acid Gas Filter P100 Replacement Respirator Cartridges. Package contains two (2) respirator cartridges. This NIOSH-approved acid gas cartridge/P100 filter can be used for a variety of applications, including chemical manufacturing, glass etching, pulp and paper processing, and laboratory work. The swept-back design offers enhanced comfort and visibility. When properly fitted, this cartridge helps provide respiratory protection from chlorine, hydrogen chloride, sulfur dioxide or chlorine dioxide, hydrogen sulfide, as well as non-oil and oil particulates at concentrations up to 10 times the Permissible Exposure Limit (PEL) with half facepieces or 50 times PEL with full facepieces.