A respirator fit test is an OSHA-required evaluation that ensures a respirator properly seals to your face for adequate protection against airborne hazards. During the test, you’ll perform seven exercises (breathing, head movements, talking, bending) while wearing the respirator. The test verifies that no contaminated air leaks into your breathing zone through gaps in the seal.

OSHA requires annual fit testing at minimum. Additional testing is needed when: changing respirator models or sizes, experiencing significant weight change (±10 pounds), undergoing facial changes (dental work, surgery), or when poor fit is observed. Some industries require more frequent testing—healthcare during outbreaks or high-risk environments may test semi-annually. Medical clearance must always precede fit testing.

The employee should be fit tested with another type/model/size respirator or the employer should provide a loose fitting respirator to ensure the employee can perform the duties as assigned if re-assignment is not possible. 

Be clean-shaven where the respirator seals—no facial hair or stubble allowed. Avoid eating, drinking (except water), smoking, or gum for 30 minutes before testing. Bring your safety glasses, hard hat, or other PPE normally worn with respirators. Ensure you’re healthy (no congestion or respiratory illness) and have completed medical clearance. Wear typical work clothing and bring any personally-assigned respirators if applicable.

Anyone required to wear a tight-fitting respirator for workplace protection must be fit tested per OSHA standards. This includes workers in healthcare (N95s), construction (silica/asbestos protection), manufacturing (chemical vapors), emergency response (SCBAs), laboratories, agriculture, and any industry with mandatory respiratory protection. Loose-fitting respirators (PAPRs with hoods) don’t require fit testing.