Reference

A user seal check is the fast self-test you run every time you put on a tight-fitting respirator to confirm the facepiece is sealed to your skin. This guide walks through the positive and negative pressure methods required by OSHA 1910.134 Appendix B-1, explains why a seal check is not a fit test, and shows a half mask example.

OSHA 1910.134(h) requires written procedures for cleaning, inspecting, storing, and repairing respirators. Pre-use inspection is required before every use; emergency respirators require monthly inspection. This guide covers the 1910.134(h) workflow: inspection checklist, cleaning methods, storage conditions, and repair vs replace rules.

OSHA 29 CFR 1910.134 governs respiratory protection programs across general industry and construction. This guide covers every major section: written programs, APF selection, medical evaluations, fit testing, user seal checks, cartridge change-out, IDLH requirements, training, recordkeeping, and a step-by-step compliance example.

What Happens If a Respirator Doesn't Fit: A respirator that does not seal properly against the face stops working as rated. Fit failure collapses the assigned protection factor (APF) - a half-face respirator with an APF of 10 can deliver as little as 2× protection if the face seal leaks.