Under 29 CFR 1910.134—adopted for construction via 29 CFR 1926.103—contractors must run a written respiratory protection program covering hazard assessment, medical evaluation, fit testing, training, and maintenance before any worker puts on a respirator.
What the Written Program Must Include
Your written respiratory protection program is the foundation of compliance under 29 CFR 1910.134(c)(1). OSHA requires it to be worksite-specific—not a downloaded template with your logo on it. Inspectors look for actual hazards, actual respirators, and actual procedures tied to your site.
The program must cover all of the following:
- Procedures for selecting respirators based on identified hazards
- Medical evaluation procedures
- Fit testing procedures for tight-fitting facepieces
- Procedures for proper use in routine and emergency situations
- Cleaning, disinfecting, storing, inspecting, repairing, and discarding respirators
- Breathing air quality procedures for atmosphere-supplying respirators
- Worker training on hazards and proper respirator use
- A process for regularly evaluating program effectiveness
The program must name a designated program administrator whose qualifications match the complexity of your program. For a simple two-respirator program, that may be a trained safety lead. For programs involving IDLH atmospheres, confined space, or SCBA, OSHA expects more extensive experience.
You must update the written program whenever workplace conditions change in a way that affects respirator use.
Hazard Assessment Comes First
Before you select a single respirator, 29 CFR 1910.134(d)(1) requires a written hazard assessment. You must identify the chemical state and physical form of each contaminant—dust, fume, mist, gas, or vapor—and evaluate both routine tasks and reasonably foreseeable emergencies.
Oxygen-deficient atmospheres are defined in 29 CFR 1910.134(b) as any atmosphere below 19.5% oxygen by volume. Air-purifying respirators are prohibited there—only atmosphere-supplying equipment works.
IDLH atmospheres permit only a full facepiece pressure-demand SCBA or a full facepiece pressure-demand supplied-air respirator with an auxiliary self-contained air supply, per 29 CFR 1910.134(d)(2).
Assigned Protection Factors and the MUC
The Assigned Protection Factor (APF) tells you how much protection a respirator class provides when your program is properly run. APF values from Table 1 of 29 CFR 1910.134(d)(3)(i)(A):
| Respirator Type | APF |
|---|---|
| Quarter-mask filtering facepiece | 5 |
| Half-mask elastomeric (APR) | 10 |
| Full facepiece elastomeric (APR) | 50 |
| Loose-fitting PAPR | 25 |
| Tight-fitting half-mask PAPR | 50 |
| Tight-fitting full facepiece PAPR | 1,000 |
| Pressure-demand SCBA | 10,000 |
Your Maximum Use Concentration (MUC) = APF × PEL. But the MUC is also capped by the IDLH. If your math puts the MUC above the IDLH, you cannot use an air-purifying respirator at that concentration regardless of APF.
Medical Evaluation: The Mandatory First Step
No worker gets fit tested or wears a respirator until medical clearance is in hand. That sequence is not optional—it is established in 29 CFR 1910.134(e)(1).
The evaluation uses the questionnaire in Appendix C to 1910.134. You cannot shorten it or create your own version. The worker submits the completed questionnaire directly to the Physician or Other Licensed Health Care Professional (PLHCP)—you never see the responses.
Before the PLHCP evaluates your worker, you must send them a mandatory information packet under 29 CFR 1910.134(e)(5) that includes:
- The type and weight of the respirator
- Duration and frequency of use
- Expected physical work effort
- Additional PPE the worker will wear
- Temperature and humidity extremes at the site
- A copy of your written program and 29 CFR 1910.134
Missing any of those items makes the evaluation incomplete and the clearance invalid.
The PLHCP sends you a written recommendation under 29 CFR 1910.134(e)(6) stating only whether the worker is cleared, any limitations, and whether follow-up is needed. A clearance for a half-mask APR does not authorize the same worker to wear an SCBA—if the respirator type changes, re-evaluate.
Medical re-evaluation is also required when a worker reports symptoms that may affect respirator use, when you or the PLHCP observe a problem, or when workplace conditions change substantially enough to increase the physiological burden on the worker.
Medical evaluations must be provided at no cost to the employee.
Fit Testing: Equipment- and Employer-Specific
Under 29 CFR 1910.134(f)(2), every worker using a tight-fitting facepiece must pass a fit test before first use, when switching to a different make, model, or size, and at least annually.
Fit tests are also required after any change in physical condition that could affect fit—facial scarring, dental work, significant weight change.
Qualitative fit testing (QLFT) uses sensory detection—isoamyl acetate, saccharin, Bitrex, or irritant smoke—and may only be used for negative-pressure air-purifying respirators where the required fit factor is 100 or less.
Quantitative fit testing (QNFT) measures actual leakage and is required when you need to document a fit factor above what QLFT can verify. A full facepiece APR only achieves its APF of 50 when a QNFT produces a fit factor of 500 or greater—a QLFT alone caps that mask at an effective APF of 10.
Fit-test results from a prior employer or a different facepiece do not transfer. A new hire's fit test from last month's contractor is not valid on your equipment.
The Facial Hair Rule: No Exceptions
29 CFR 1910.134(g)(1)(i)(A) prohibits any facial hair between the sealing surface and the face of a tight-fitting respirator. The standard is functional, not measured—even one to two days of stubble can compromise the seal.
A worker cannot produce a valid fit test while facial hair is crossing the seal. If they shave after the test and then grow stubble, the fit test is no longer valid. Supervisors have an active duty to check before allowing any worker to enter a hazard area in a tight-fitting respirator.
For workers who cannot shave due to a medical condition or religious practice, the only compliant path is a loose-fitting PAPR, a supplied-air hood, or reassignment to work not requiring respiratory protection.
User Seal Checks: Every Donning, Every Time
29 CFR 1910.134(g)(1) requires workers to perform a user seal check every time they put on a tight-fitting respirator. This is not the same as a fit test—it is a pre-entry check.
The two accepted methods from Appendix B-1 are:
- Positive pressure check: Block the exhalation valve, exhale gently, and confirm no outward air leakage at the seal.
- Negative pressure check: Cover the cartridge inlets, inhale gently until the facepiece collapses slightly, hold breath for ten seconds, and confirm no inward leakage.
Workers must use the manufacturer's recommended procedure if one exists, or Appendix B-1 if no manufacturer procedure is provided.
Cleaning, Maintenance, and Storage
29 CFR 1910.134(h) sets mandatory standards—not suggestions—for respirator upkeep.
Respirators assigned to one worker must be cleaned and disinfected often enough to stay sanitary. Shared respirators must be cleaned before each new user. Emergency-use respirators must be cleaned after every use.
The Appendix B-2 cleaning procedure requires full disassembly, washing in warm water with mild detergent, rinsing, disinfecting in an approved solution (such as a 50 ppm hypochlorite solution), rinsing again, air drying, reassembly, and a function check. Wiping down the mask with a paper towel is not cleaning under this standard.
Storage must protect respirators from dust, sunlight, extreme temperatures, excessive moisture, damaging chemicals, and deformation of the facepiece or valves.
Repairs must use original manufacturer parts only. Non-OEM parts void the NIOSH certification of the device.
Cartridge Change-Out Schedules
When a contaminant has poor warning properties—meaning the odor threshold is at or above the PEL—relying on smell to catch breakthrough is a citable program defect under 29 CFR 1910.134(d)(3)(iii)(B)(2). You must establish a change-out schedule based on objective data.
Acceptable objective data includes manufacturer service-life information, mathematical modeling, or workplace sampling. The written program must document the calculations, the data used, and the resulting change intervals for each task.
Industry practice applies a safety factor of 0.5 or less to calculated breakthrough times. Environmental factors—particularly high humidity—can cut cartridge life significantly compared to manufacturer test conditions. A schedule calculated for a climate-controlled environment is not valid outdoors in summer.
If NIOSH has certified an End-of-Service-Life Indicator (ESLI) for your specific chemical, you may use it instead of a change schedule.
Training Requirements
Under 29 CFR 1910.134(k), training must occur before a worker first uses a respirator. Retraining is required at least annually, and earlier if workplace conditions or respirator type change, if a worker fails a test or cannot demonstrate proper use, or if the worker is assigned to a different respirator or hazard.
Training must cover why the respirator is necessary, what happens if fit or maintenance is inadequate, the respirator's limitations, how to don and doff correctly, how to perform a user seal check, how to clean and maintain the equipment, how to recognize cartridge failure or medical distress, and how to exit the area if the respirator is failing.
Document each training session with the date, content covered, trainer name, and attendees.
Annual Program Evaluation
29 CFR 1910.134(l) requires you to regularly evaluate whether your written program is actually being followed in the field. Desk audits of fit-test records alone do not satisfy this requirement.
The evaluation must include direct observation of workers using respirators and direct consultation with those workers—not just their supervisors—to surface any problems. You must assess respirator fit, respirator selection, actual use conditions, and maintenance practices.
Any deficiency you find must be corrected. Document the evaluation date, who conducted it, what was observed, what workers said, any deficiencies found, and when those deficiencies were corrected.
Where Contractors Get Cited Most Often
- Generic written programs that do not name actual hazards, respirators, or tasks on your site
- Allowing fit testing before medical clearance is received and documented
- Fit test results from prior employers or different equipment treated as valid
- Facial hair crossing the seal line on any tight-fitting respirator
- Change-out schedules based on smell for chemicals with poor warning properties
- Voluntary use of elastomeric or cartridge respirators without a written program covering medical evaluation, cleaning, and storage
- Annual program evaluation conducted as a paperwork exercise without field observation or worker consultation
Subcontractors and Temporary Workers
OSHA's Multi-Employer Citation Policy means you can be cited for a subcontractor's respiratory protection failures on your site. Each employer must have its own written program, but as the controlling employer you share responsibility for hazards workers are exposed to.
Before a subcontractor mobilizes, confirm in writing which employer owns medical evaluations, fit tests, and training for each worker. Fit tests from the sub's equipment do not transfer to yours. Records—medical evaluations, fit tests, training—must be retained for the duration of employment plus 30 years.
Jobsite tracks OSHA training records, fit test dates, medical clearance status, and compliance deadlines for your entire crew—including subcontractors. See how it works at [Jobsite Safety Compliance](/product/safety-compliance).
FAQ
Does voluntary respirator use require a written program?
It depends on the respirator type. Workers who voluntarily use only filtering facepieces (N95s) do not trigger a written program, but you must still give them the Appendix D information under 29 CFR 1910.134(c)(2)(i). If a worker voluntarily uses any other respirator—an elastomeric half-mask, a cartridge respirator, a PAPR—you must establish written program elements covering medical evaluation, cleaning, storage, and maintenance under 29 CFR 1910.134(c)(2)(ii).
Can a worker's fit test from a prior employer satisfy our requirement?
No. Fit test results are not portable between employers or between facepiece makes, models, or sizes. Under 29 CFR 1910.134(f)(2), you must fit test the worker on your equipment before first use, regardless of what documentation they bring from a previous job.
What triggers a medical re-evaluation after initial clearance?
Under 29 CFR 1910.134(e)(7), you must provide additional medical evaluation if the worker reports signs or symptoms that may affect respirator use, if a PLHCP, supervisor, or program administrator determines it is necessary, or if workplace conditions change in a way that substantially increases the physical burden on the worker. Medical clearance is not a one-time event.
What is the difference between a user seal check and a fit test?
A fit test under 29 CFR 1910.134(f) is a formal, protocol-driven test conducted before first use and at least annually to verify that a specific facepiece seals properly on a specific worker's face. A user seal check under 29 CFR 1910.134(g)(1) is a quick positive- or negative-pressure check the worker performs every single time they put on the respirator. Documenting fit tests does not satisfy the seal-check requirement, and seal checks do not substitute for fit testing.
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The Jobsite Editorial Team — Construction safety & OSHA compliance
The Jobsite Editorial Team writes the safety and compliance library behind Jobsite, the construction safety, OSHA compliance, and training platform for contractors. Every article starts from the primary regulatory text — the CFR section itself, not a summary of it — and is fact-checked against that source before it publishes, so what you read here is what the standard actually requires of small and mid-size contractors in the field.