What method is used to determine whether a respirator fits properly?

The method used to determine whether a respirator fits properly is known as a fit test. This process involves evaluating the respirator's seal on the user’s face to ensure that it provides adequate protection against airborne contaminants. A fit test is typically conducted as part of the respiratory protection program, and it assesses the effectiveness of the respirator's fit through either qualitative or quantitative methods.

Qualitative fit testing often involves using a test agent, such as a bitter or sweet solution, to determine if the wearer can detect it while wearing the respirator. Quantitative fit testing uses specialized equipment to measure the amount of leakage. This testing is crucial because even minor leaks can significantly reduce the respirator's protective capabilities.

In contrast, a fit check is a quick method the wearer can perform before using a respirator, but it doesn't replace the necessity of a proper fit test. Wear test and seal test are not standardized methods for assessing respirator fit, further emphasizing why the fit test is the appropriate choice for determining proper respirator fitting.