5.2 Respiratory Protection Programs and Filtering Facepiece Respirators

Respiratory Protection Programs and NIOSH-Approved Respirators

A surgical mask is a loose-fitting source-control and splash barrier; it is not a respirator. When an employer requires respirator use to protect workers, OSHA 29 CFR 1910.134 requires a written, worksite-specific respiratory-protection program. Dental aerosol generation does not by itself create one universal N95 rule—the infectious hazard, public-health guidance, and employer assessment determine when respiratory protection is needed.

Program Elements

A qualified program administrator oversees:

• evaluation of respiratory hazards and workplace conditions;
• selection of NIOSH-approved respirators appropriate to the hazard;
• medical evaluation before fit testing or required use;
• fit testing for tight-fitting respirators before initial use, at least annually, and when model, size, or facial condition changes;
• training, user seal checks, inspection, cleaning, storage, and replacement; and
• periodic program evaluation and recordkeeping.

A respirator is identified by its NIOSH approval and exact make, model, style, and size. A marketplace “KN95-style” label or filtration claim is not a NIOSH approval. Verify approval markings and current NIOSH records.

Medical Evaluation

Before an employee is fit tested or required to use a respirator, a physician or other licensed healthcare professional (PLHCP) reviews the OSHA questionnaire or an equivalent medical evaluation. The employer receives the written recommendation about ability and limitations, not the worker’s confidential answers.

Medical evaluation is not automatically annual. Reevaluation occurs when the employee reports related symptoms, the PLHCP or administrator requests it, observations during fit testing indicate need, or workplace or respirator conditions substantially increase burden.

Fit Testing

Fit testing verifies that a specific tight-fitting respirator model and size can seal to the wearer. Qualitative fit testing produces a pass/fail response to a challenge agent. Quantitative testing measures leakage and requires the OSHA passing fit factor for the respirator class; a half-mask, including a filtering facepiece N95, uses a minimum fit factor of 100.

Repeat fit testing at least every 12 months and whenever the worker changes respirator make, model, style, or size or has a physical change that could affect fit. Do not use an invented weight-change threshold; dental work, surgery, scarring, or facial changes are evaluated by their effect on fit.

Facial hair, stubble, jewelry, eyewear, or clothing must not cross the sealing surface or interfere with valve function. The rule is about interference with the seal, not a universal claim that every single day of stubble fails every wearer. A loose-fitting hooded PAPR can be an option when a tight face seal is not possible and does not require fit testing, although it still requires medical evaluation, training, and program controls. A tight-fitting PAPR does require fit testing.

User Seal Check

A user seal check is performed every time a tight-fitting respirator is donned, using the manufacturer’s positive-pressure, negative-pressure, or other approved method. It confirms that the respirator is seated for that wearing; it does not replace fit testing. Some filtering facepieces cannot be checked by cupping both hands over the front without disturbing them, so follow the respirator IFU rather than imposing both maneuvers on every model.

If a seal cannot be achieved, leave or do not enter the hazardous area and obtain another fitted respirator or appropriate alternative.

N95 and Surgical N95

NIOSH certifies particulate respirators by filter class and efficiency. An N95 filters at least 95% under the NIOSH test for its class; the “0.3 micron” shorthand does not mean smaller particles pass freely. Actual protection also depends on fit, condition, correct use, and the contaminant.

A surgical N95 is NIOSH approved as a respirator and also cleared or authorized for medical-device fluid resistance. It can be useful where both inhalation and splash hazards exist. A nonsurgical N95 can protect against the inhalation hazard but may require a separate face shield or other splash protection. Select the ensemble from the assessment.

Elastomeric respirators use replaceable filters and require a cleaning, disinfection, inspection, storage, and cartridge-change procedure. PAPRs use a blower and hood or facepiece; filter class, airflow check, battery, and decontamination follow the manufacturer.

Storage, Extended Use, and Reuse

Disposable filtering facepiece respirators are ordinarily single-use. Follow the manufacturer and facility respiratory program for maximum use, storage, and replacement. Discard when wet, visibly soiled, contaminated with blood or saliva, damaged, difficult to breathe through, or unable to pass a seal check.

Extended-use or limited-reuse strategies may be introduced during a documented shortage under current authoritative guidance. They are not routine standing practice. If reuse is authorized, the plan addresses labeling, separation, hand hygiene, handling, storage, maximum donnings, and manufacturer limits. Do not use a universal paper-bag rotation or sealed plastic bag rule independent of that plan.

Training and Evaluation

Training covers why the respirator is needed, limitations, inspection, donning and doffing, seal checking, storage, and recognition of medical symptoms. Evaluate the program in actual dental workflows, including communication, visibility, compatibility with loupes and face shields, and contamination during doffing.

The exam-safe distinction is: medical evaluation before use; fit test for the exact tight-fitting model at least annually; seal check every donning; program whenever use is required.