Glossary
Fit Test
A test that verifies a particular respirator model and size achieves an acceptable seal on a specific worker's face.
A fit test verifies that a particular respirator model and size achieves an acceptable seal on a specific worker’s face. OSHA 29 CFR 1910.134 (the Respiratory Protection standard) requires fit testing before a worker first wears a tight-fitting respirator, when the worker changes respirator make or model, and at least annually thereafter.
Two test methods exist. Qualitative fit testing (QLFT) uses a sensory challenge (saccharin, Bitrex, irritant smoke) and relies on the worker’s ability to detect the challenge agent. Quantitative fit testing (QNFT) uses an instrument to measure the actual leakage around the seal.
Fit-test records are required to include the worker’s name, the test date, the type of test, the make and model of respirator passed, and the date of the next test. Records are kept until the next fit test or for the duration of the requirement.
A worker who has not been fit-tested cannot wear a tight-fitting respirator. A worker who fails the fit test for a particular model needs to try a different make or size; some workers can’t be fit on any APR and require a PAPR or other loose-fitting alternative.