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A respirator seal check (also known as a pressure check or fit check) is a very different procedure than a fit test. A seal check determines the effectiveness of the seal between the respirator and the skin, and must be done EVERY time the respirator is worn. Two common ways to check the seal are the positive seal check and the negative seal check. For a half-mask cartridge respirator, place the respirator on your face, then pull the top (halo-shaped in some models) plastic strap and adjust it over and on top of your head. Next, connect the straps that go...

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