Tight-fitting respirators can only provide expected protection if they fit correctly, so fit-testing each employee is critical.
There are two kinds of tests, and OSHA specifies which can be used depending on the respirator type.
A qualitative fit test (QLFT) is pass/fail and relies on the employee’s senses using one of four OSHA-accepted test agents:
QNFTs use the same seven exercises as QLFTs, plus an additional “grimace” test where the subject smiles or frowns for 15 seconds.
See below demonstrations for how to wear different respirators and appropriate seal checks.