3M half face piece disposable acid gas respirators 5000 Series are pre-assembled, have no Spare parts and require no maintenance. Their lightweight, well-balanced design contributes to greater worker comfort. These half face respirators are NIOSH approved for certain organic vapors and acid gases. For use in a variety of applications including pharmaceutical, petrochemical, utilities, aluminum reduction, chemical manufacturing, laboratories and pulp and paper. This breathing filter mask is available in sizes small, medium and large. Comes with one pair of organic vapor/acid gas filter cartridges.