User Seal Check Procedures (Mandatory)
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Appendix B-1 to § 1910.134: User Seal Check Procedures (Mandatory)
The individual who uses a tight-fitting respirator is to perform a user seal check to ensure that an adequate seal is achieved each time the respirator is put on. Either the positive and negative pressure checks listed in this appendix, or the respirator manufacturer's recommended user seal check method shall be used. User seal checks are not substitutes for qualitative or quantitative fit tests.
I. Facepiece Positive and/or Negative Pressure Checks