What is a respirator fit test?
A fit test uses a protocol to qualitatively or quantitatively evaluate how a respirator fits an individual. A qualitative test is pass or fail and relies on the wearer's response to a test agent. A quantitative test numerically measures leakage into the respirator.
By Cairn. Updated . Sources: eCFR text as of October 27, 2026.
The legal definitions
“Fit test means the use of a protocol to qualitatively or quantitatively evaluate the fit of a respirator on an individual. (See also Qualitative fit test QLFT and Quantitative fit test QNFT.)”
“Qualitative fit test (QLFT) means a pass/fail fit test to assess the adequacy of respirator fit that relies on the individual's response to the test agent.”
“Quantitative fit test (QNFT) means an assessment of the adequacy of respirator fit by numerically measuring the amount of leakage into the respirator.”
Where it applies
- 29 CFR 1910.134, Respiratory protection 22 paragraphs use the term. Read the text on eCFR.
- 29 CFR 1926.62, Lead One paragraph uses the term. Read the text on eCFR.
In the enforcement record
Federal and state-plan agencies issued 57,190 cited violations under 29 CFR 1910.134, Respiratory protection, from January 2016 through September 10, 2026. The section ranks 3rd among the 248 sections of 29 CFR cited at least 50 times. This is the count for the whole section, not for the term alone.
Cairn data, October 2026 snapshot.
See the full record for 29 CFR 1910.134Sources
- 29 CFR 1910.134, Respiratory protection. eCFR, text as of October 27, 2026.
- Cairn data, October 2026 snapshot. Cairn analysis of the OSHA enforcement record.
Written by Cairn, updated . The quoted text is copied from the sources above. A test compares each quotation with a stored copy of the source, and a separate script compares that copy with the live sources. This page explains the law and is not legal advice.