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General regulatory information for employers, safety officers and clinic or laboratory staff. It is not medical advice and not a fit-test procedure.
Short answer
Under OSHA’s Respiratory Protection standard, 29 CFR 1910.134(f), an employer must fit test every employee who wears a tight-fitting respirator: before first use, whenever a different facepiece (make, model, style or size) is used, and at least annually afterwards. The test must use an OSHA-accepted qualitative or quantitative protocol, and the employer must keep a record until the next test.
What the OSHA fit test requirement is
Paragraph (f) says the employee is fit tested with the same make, model, style and size of respirator that will be used. Paragraph (f)(1) applies it to anyone required to use a tight-fitting facepiece, and (f)(5) requires an OSHA-accepted qualitative (QLFT) or quantitative (QNFT) protocol. The fit test sits inside the written respiratory protection program that (c)(1) requires, with worksite-specific procedures, and it comes after the medical evaluation: (e) requires the evaluation “before the employee is fit tested or required to use the respirator in the workplace.” See respirator medical clearance and the Appendix C questionnaire and the respiratory protection program for laboratories.
For the difference between the two test types and how they work in practice, see Respirator Fit Testing: Qualitative vs. Quantitative. This page is organised around what an employer must be able to show an inspector.
When a fit test is required
- Before initial use of a tight-fitting respirator, per (f)(2).
- When a different facepiece is used (size, style, model or make), per (f)(2).
- At least annually, per (f)(2).
- After a change in physical condition that could affect fit, per (f)(3), which names facial scarring, dental changes, cosmetic surgery and an obvious change in body weight.
- When the employee reports unacceptable fit: (f)(4) requires a reasonable opportunity to select a different facepiece and be retested.
Facial hair matters before the test starts: (g)(1)(i)(A) bars a tight-fitting facepiece for employees with facial hair that comes between the sealing surface and the face. NIOSH, on its fit-testing page (updated 2026-10-28), says facial hair that does not interfere with the seal or the exhalation valve may be allowed with the respiratory protection administrator’s approval.
Which respirators need one
NIOSH states that OSHA requires fit testing for tight-fitting respirators, including filtering facepieces, elastomeric facepieces, tight-fitting powered air-purifying respirators (PAPRs) and self-contained breathing apparatus, and that loose-fitting types such as a loose-hood PAPR do not require one. Under (f)(8), tight-fitting atmosphere-supplying and powered air-purifying respirators are fit tested in negative pressure mode, whichever mode they run in at work. See PAPR hoods and fit-test rules, N95 sizes and respirator levels.
OSHA-accepted protocols and pass criteria
Appendix A of 1910.134 (mandatory) lists the accepted protocols. The table maps each to its type and pass rule, all from 1910.134(f) and Appendix A.
| Type | Accepted protocols (Appendix A) | Pass rule |
|---|---|---|
| Qualitative (QLFT) | Isoamyl acetate (odor), saccharin aerosol (taste), Bitrex (denatonium benzoate) aerosol, irritant smoke (stannic chloride; requires HEPA or P100 filters) | Pass/fail; any detected taste, smell or irritant response is a fail. Permitted only for negative pressure air-purifying respirators that must achieve a fit factor of 100 or less, per (f)(6). |
| Quantitative (QNFT) | Generated aerosol, ambient aerosol condensation nuclei counter (CNC), controlled negative pressure (CNP), CNP REDON | Fit factor of at least 100 for tight-fitting half facepieces and at least 500 for tight-fitting full facepieces, per (f)(7). |
NIOSH notes that it does not endorse or recommend the irritant smoke fit test. NIOSH also notes that a respirator used in a quantitative test must be modified (punched) for the test, so the tester disposes of it. Each protocol has its own exercises and screening steps in Appendix A, and a user seal check is part of the process; those procedures are set out in the standard itself and are not reproduced here.
Records an employer must keep
Paragraph (m)(2) lists what a fit-test record must contain, and requires that fit test records be retained for respirator users until the next fit test is administered. Use it as an audit checklist:
- Employee name or identifier.
- Type of fit test (qualitative or quantitative).
- Make, model, style and size of the respirator tested.
- Date of the test.
- Result: pass/fail for QLFT, or the fit factor and test recording for QNFT.
The comparison most often missed is between the record and what the employee is actually issued. Because (f) ties the test to the same make, model, style and size that will be used, a record that names a different size or model than the one in the cabinet does not show compliance for that respirator.
What to confirm with a fit-test provider
These items follow from the standard, not from any provider’s marketing. Ask that the written record state: the protocol name used (one of the Appendix A protocols above); the exact respirator make, model, style and size; the result or fit factor; and the test date. Also confirm that the protocol is permitted for the respirator type under (f)(6) and (f)(7), and that the test was in negative pressure mode for a tight-fitting PAPR or supplied-air respirator under (f)(8).
Common misunderstandings
“A passed test covers any respirator of the same type.”
No. It covers the make, model, style and size tested; a change to any of them triggers a new test under (f)(2).
“Annual means once for life.”
The standard says at least annually, plus the event-based triggers in (f)(3) and (f)(4).
“A fit test replaces the seal check.”
They are different. The fit test is an employer-administered protocol; the user seal check is something the wearer performs, and Appendix A includes it in the test process.
“A medical clearance can come later.”
Paragraph (e) puts it before the fit test.
FAQ
What is an OSHA respirator fit test?
A test required by 29 CFR 1910.134(f) that checks whether a specific tight-fitting respirator seals on a specific employee, using an OSHA-accepted qualitative or quantitative protocol.
What are the respirator fit test requirements?
Test before first use, when the facepiece changes, at least annually, after relevant physical changes, and on a reported fit problem; use an accepted protocol; keep the (m)(2) record until the next test.
How long must the record be kept?
Until the next fit test is administered, per (m)(2).
Do loose-fitting respirators need a fit test?
According to NIOSH, no, for loose-fitting types such as a loose-hood PAPR.
Sources
- OSHA, 29 CFR 1910.134, Respiratory protection, paragraphs (c), (e), (f), (g), (m). Checked 2026-11-01.
- OSHA, 29 CFR 1910.134 Appendix A, Fit testing procedures (mandatory). Checked 2026-11-01.
- CDC NIOSH, Respirator fit testing (page updated 2026-10-28). Checked 2026-11-01.
Related CASRAI guide: OSHA PPE standard, 29 CFR 1910.132 and Subpart I.
