Filter cartridges protect against dusts, particles and mists. Chemical cartridges protect against gases and vapors. Combination cartridges deliver protection for both particulate and gaseous contaminants. Designed for easy installation by threading directly to the cartridge receptacles on Comfo and other twin-cartridges respirators. All cartridges are interchangeable and are colour-coded to indicate the type of protection offered. Most cartridges are incinerable.