If fogging occurs on the facepiece during pre-use checks, what is the appropriate course of action?

If fogging occurs on the facepiece during pre-use checks, what is the appropriate course of action?

• A. Ignore fogging and proceed with entry
• B. Perform a fog test and adjust the facepiece fit to minimize fogging
• C. If fogging occurs, clear the lenses with approved cleaner, ensure proper seal, and re-check vision; continue after fogging resolved
• D. Discard the facepiece

Answer: (C)