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This design is compatible with the 3M 6500/6501/6502/6503/6502QL Half Face Mask Respirator
The 3M Half Face Mask Respirator does not have a built in filter for the exhaust port and can be dangerous because your are exhaling unfiltered air from your 3M Respirator.
Made specially for health care workers, this design allows you to fit a cut out of a normal face mask and place it inside the respirator.
Use a cut out from a face mask then snap the pieces together.
__DisclaimerThis design does not intend to replace official products meant for filtering exhaust valves. Use at your own discretion._