Fit testing can be conducted using two primary methods: qualitative and quantitative testing. Qualitative fit testing involves the use of a test agent with a distinct taste or smell. The wearer carries out a series of tasks in a controlled environment to determine if they can detect the test agent, indicating a poor fit. On the other hand, quantitative fit testing uses a machine to measure the amount of leakage into the respirator. This provides a numerical measurement of the fit and is generally considered more precise.
