What does a qualitative Fit Test measure?

A qualitative fit test measures how well a respirator seals to the face by using a test agent that is either detectable or undetectable by the wearer. This test typically involves using substances like sweet or bitter solutions that the wearer can taste or smell if the respirator does not fit properly. The primary purpose is to ensure that there are no leaks and that the respirator provides the intended protective barrier against airborne contaminants.

The significance of this testing method lies in its ability to subjectively assess the user's experience with the respirator's seal rather than quantitatively measuring the amount of air leakage, which is more pertinent to quantitative fit tests. Additionally, while comfort and performance against specific gases are important facets of respiratory protection, those aspects are not the focus of a qualitative fit test. Thus, using a test agent specifically toward determining seal integrity is what defines this type of fit test.