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How is it determined if the check valves of the facepiece are functioning properly?

April 26, 2017facepiece functioning properly valves

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How is it determined if the check valves of the facepiece are functioning properly?

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The User Manual specifies a check valve and face seal functionality test that is to be performed each time the BioPak is donned. This test will validate check valve function as well as determine that the face seal of the facepiece is properly made on the user.