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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.