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When using a respirator or N95 facemask on the job, you will need to replace your respirator filter or cartridge from time to time to make sure your respirator is working properly. At PK Safety, we get this question quite a bit, “When do I change my respirator filter?” The truth is that there is no one right answer. The lifespan of your filter or cartridge depends on how often you’re using your respirator, the target substance, and the conditions of your work environment. Use these tips …