<<< Back to Respirator Change Schedules

Safety Factors for Cartridge Service Life Safety factors are reductions to an estimated service life to ensure that the actual service life will not be exceeded. They are generally applied to the estimate for non-correctable conditions such as presence of unknown contaminants, variations in work rate, or emergency situations. Thus the change schedule will end before the cartridge service life expires. The safety factor reduction depends in part upon the accuracy of estimation methods and in part upon workplace variables.