When is the appropriate time to check the fit of a respirator?

The appropriate time to check the fit of a respirator is every time it is worn. This practice is crucial because ensuring a proper fit is essential for effective respiratory protection. A respirator must form a tight seal against the face to prevent inhalation of harmful airborne contaminants, including asbestos fibers.

Variability in facial contours, changes in facial hair, or even slight adjustments in the respirator can affect the fit. Thus, conducting a fit check each time ensures that the respirator functions as intended, providing maximum protection during every use. This routine practice helps to maintain safety standards in environments where hazardous materials, like asbestos, are present.

In contrast, checking the fit only before the first use, once a week, or only after cleaning does not account for any changes that may have occurred since the last use, making these approaches inadequate for ensuring reliable protection.