How often is a qualitative or quantitative fit test required for a face mask?

A fit test, whether qualitative or quantitative, is essential for ensuring that a respirator masks properly and effectively protects the wearer from airborne contaminants. The correct frequency for administering this test is at the time the mask is assigned to a worker and annually thereafter. This ensures that the respirator fits well over time, taking into account any changes in the worker's facial structure or changes in the type of masks being used.

Annual testing is vital to maintain compliance with safety regulations and to guarantee that the correct protection is being provided, which is particularly important in hazardous work environments such as those involving asbestos. Proper fit ensures that there are no leaks and that the mask provides an adequate seal against potentially harmful substances.

Testing only when requested, or setting infrequent intervals, would not adequately confirm ongoing effectiveness or safety, while monthly testing during the first year would be unnecessary and impractical if the initial testing and subsequent annual checks are proper.