Supplied-air respirator (SAR) cartridges and filters are installed in waistbelt regulators to provide protection against a variety of individual contaminants or combinations of contaminants, including dusts, particles, mists, aerosols, fumes, gases, and/or vapors. Correct product selection depends on the environment(s) in which the product will be used and the type(s) of hazard(s) or risk(s) expected in the selected environment(s). Product service life depends on many factors, including environmental conditions, breathing rate, cartridge filtering capacity, and the quantity of contaminants in the air. Regulatory compliance details for each filter and filter/cartridge package can be obtained at the individual product level and should be carefully scrutinized during selection.