How do you verify a proper facepiece seal after donning?

How do you verify a proper facepiece seal after donning?

• A. Perform a seal check (positive or negative-pressure test) per agency SOP; look for leaks at the face seal and ensure the mask stays secure with breathing.
• B. Rely on a visual inspection only.
• C. Pinch the nose and test by talking.
• D. Check only the strap tension.

Answer: (C)

A proper facepiece seal must be verified after donning to prevent contaminated air from bypassing the filter. Pinching the nose and testing by talking provides a quick, practical check of the seal around the mouth and cheeks: pinching the nose helps prevent air from escaping through the nose, so any air leaking around the facepiece edge will become audible or feelable as you speak. If you detect a hiss, whistle, or movement of air at the edges, the seal isn’t tight and you need to readjust or re-don. If there’s no audible or palpable leak and the facepiece stays firmly in place while you talk and breathe, the seal is functioning. Visual checks or relying only on strap tension don’t reliably reveal leaks, because a mask can look in place yet still leak during breathing. For completeness, follow your agency’s seal-check procedure (positive or negative-pressure) as well, but the nose-pinching, talking test is a useful immediate method to confirm the seal.

A proper facepiece seal must be verified after donning to prevent contaminated air from bypassing the filter. Pinching the nose and testing by talking provides a quick, practical check of the seal around the mouth and cheeks: pinching the nose helps prevent air from escaping through the nose, so any air leaking around the facepiece edge will become audible or feelable as you speak. If you detect a hiss, whistle, or movement of air at the edges, the seal isn’t tight and you need to readjust or re-don. If there’s no audible or palpable leak and the facepiece stays firmly in place while you talk and breathe, the seal is functioning. Visual checks or relying only on strap tension don’t reliably reveal leaks, because a mask can look in place yet still leak during breathing. For completeness, follow your agency’s seal-check procedure (positive or negative-pressure) as well, but the nose-pinching, talking test is a useful immediate method to confirm the seal.