Each time a respirator with a tight-fitting facepiece is worn, what checks should be performed?

When using a respirator with a tight-fitting facepiece, it is crucial to conduct both a positive pressure check and a negative pressure check to ensure the respirator is properly sealed against the wearer's face.

The positive pressure check involves inhaling slightly to create a slight inward seal, which indicates that the respirator is adequately sealed and preventing contaminants from entering. This check helps confirm that the respirator is positioned correctly and that there are no leaks.

The negative pressure check, on the other hand, requires the wearer to exhale gently while blocking the exhalation valve, creating a negative pressure inside the mask. If the respirator is fitted properly, the facepiece should collapse slightly as external air is restricted from entering.

Carrying out both checks is a vital step before each use to ensure the respirator's effectiveness in providing adequate protection against airborne hazards. This dual approach is part of the comprehensive safety procedures outlined by OSHA, ensuring that users are safeguarded while in hazardous environments.