Respiratory Protection
29 CFR 1910.134 Program Guide

Why Respiratory Protection Matters

Respiratory hazards — airborne particulates, chemical vapors, gases, and oxygen-deficient atmospheres — are among the most insidious workplace dangers because they are often invisible and odorless. OSHA's Respiratory Protection Standard 29 CFR 1910.134 consistently ranks in the top five most-cited violations. The standard requires a comprehensive program whenever respirators are necessary to protect employee health or are required by the employer.

All respirators used in the workplace must be NIOSH-approved under 42 CFR Part 84. Using non-approved devices or modifying approved respirators (such as adding unauthorized filters or altering the facepiece) voids the approval and violates the standard.

Written Respiratory Protection Program

Every employer who requires respirator use must establish and maintain a written respiratory protection program with worksite-specific procedures 1910.134(c). A designated program administrator who is qualified by training or experience must oversee the program. Required elements include:

• Procedures for selecting respirators appropriate for the hazards.
• Medical evaluation procedures for employees required to wear respirators.
• Fit testing procedures (initial and annual).
• Procedures for proper use in routine and reasonably foreseeable emergency situations.
• Procedures for cleaning, disinfecting, storing, inspecting, repairing, and discarding respirators.
• Procedures for ensuring adequate air quality and quantity for atmosphere-supplying respirators.
• Training on respiratory hazards, respirator use, and program procedures.
• Program evaluation conducted at least annually.

Respirator Types and When to Use Them

Medical Evaluation

Before an employee is fit tested or required to use a respirator, the employer must provide a medical evaluation to determine the employee's ability to use a respirator 1910.134(e). The evaluation uses the OSHA Respirator Medical Evaluation Questionnaire (Appendix C to 1910.134) or an equivalent initial medical examination conducted by a physician or other licensed healthcare professional (PLHCP).

• The questionnaire must be administered during the employee's normal working hours and at no cost to the employee.
• The PLHCP must receive information about the type of respirator, the expected frequency and duration of use, physical work demands, and additional protective clothing.
• Follow-up medical examination is required if the PLHCP determines one is necessary based on questionnaire responses.
• The PLHCP provides a written recommendation to the employer indicating whether the employee is medically able to use a respirator — no diagnosis or medical details are shared with the employer.

Fit Testing

All employees who wear tight-fitting respirators must be fit tested before initial use, whenever a different size or model is used, and at least annually thereafter 1910.134(f). Two methods are recognized:

Employees must perform a user seal check (positive and negative pressure) each time the respirator is put on. This is not a substitute for fit testing but verifies the seal for that wearing. Conditions that can affect fit include facial hair (stubble or beards that cross the sealing surface), significant weight changes, dental work, or facial scarring.

IDLH Atmospheres

An atmosphere is considered Immediately Dangerous to Life or Health (IDLH) when it poses an immediate threat of death, immediate or delayed irreversible health effects, or concentrations above the IDLH value published by NIOSH. Entry into IDLH atmospheres requires 1910.134(g)(3):

• Full-face pressure-demand SCBA or a combination full-face pressure-demand SAR with an auxiliary SCBA for escape.
• At least one standby person outside the IDLH atmosphere with proper retrieval equipment and communication.
• Visual, voice, or signal line communication between the entrant(s) and standby person(s).
• The standby person must be equipped to provide effective emergency rescue.

Filter and Cartridge Selection

NIOSH certifies filters and cartridges under 42 CFR 84. Selecting the correct filter is critical — using the wrong cartridge provides zero protection against the actual hazard.

Employers must establish a change schedule for cartridges and canisters based on objective data or the manufacturer's end-of-service-life indicator (ESLI). If no ESLI is available, the employer must implement a change schedule based on contaminant concentration, humidity, breathing rate, and cartridge capacity using tools such as the OSHA Advisor or manufacturer software.

Voluntary Use vs. Required Use

When respirator use is not required by OSHA but the employer permits employees to use respirators voluntarily, the employer must still provide a copy of Appendix D (Information for Employees Using Respirators When Not Required) 1910.134(c)(2). For voluntary use of filtering facepieces (dust masks, N95s), this is the only requirement — no written program, fit testing, or medical evaluation is needed. However, if employees voluntarily use tight-fitting respirators (half-face or full-face), the employer must ensure the respirator does not create a health hazard, provide medical evaluations, and ensure proper cleaning and storage.

References