This product protects from organic vapors and acid gases (chlorine, hydrogen chloride, sulfur dioxide, hydrogen sulfide [escape], hydrogen fluoride and chlorine dioxide). It provides also 99.97% filter efficiency for all particulates. North offers a complete line of cartridges and filters for the North 5500, 7700, 5400 and 7600 Series facepieces. All cartridges and filters listed below are interchangeable with any of these masks. Filters for limited use respirators, canisters for gas masks, and PAPR cartridges are listed in the respiratory catalog with those products.