Which of the following describes fit-testing for positive-pressure, atmosphere-supplying respirators?

• A. Either qualitative or quantitative fit testing may be used
• B. Only qualitative fit testing may be used
• C. Only quantitative fit testing may be used
• D. No fit testing is required

Answer: (A)

Fit testing for a tight-fitting respirator checks that the facepiece actually seals to the wearer’s face so air doesn’t leak in around the edges. For positive-pressure, atmosphere-supplying respirators with a tight-fitting facepiece, fit testing is required before first use and at appropriate intervals afterward. You can use either method: qualitative testing relies on the wearer’s senses (taste, smell, or irritation) to detect leakage, while quantitative testing uses instruments to measure leakage and provides a numerical fit factor. Because both approaches are permitted in this context, the option stating that either qualitative or quantitative fit testing may be used is the best choice. Note that loose-fitting hoods do not require fit testing since they don’t rely on a face seal.