Fit Testing
Fit testing is the process of evaluating the seal of a tight-fitting respirator on an individual worker's face to verify it provides adequate protection against airborne hazards.
What Is Fit Testing?
Fit testing verifies that a specific make, model and size of tight-fitting respirator forms an adequate seal on a worker's face. It is required by CSA Z94.4 in Canada and OSHA 29 CFR 1910.134 in the U.S. before a worker can use a respirator in a hazardous atmosphere.
Types of Fit Testing
- Qualitative (QLFT): A pass/fail test using a taste or odour agent (e.g., Bitrex, saccharin, isoamyl acetate). The worker performs exercises while wearing the respirator; if they detect the agent, the fit fails.
- Quantitative (QNFT): Uses instrumentation (e.g., PortaCount) to measure the actual leakage into the respirator, providing a numerical fit factor. Required for some full-face respirators and SCBAs.
When Fit Testing Is Required
- Before initial use of a respirator
- Whenever a different respirator model or size is selected
- At least annually thereafter
- After significant weight change, dental work, or facial surgery that may affect fit
Track Fit Test Records
Make Safety Easy stores fit test results, tracks annual recertification dates and flags workers who need retesting - ensuring your respiratory protection program stays compliant.