How often must qualitative or quantitative fit-testing of negative pressure respirators be performed?

• A. Daily
• B. Monthly
• C. Yearly
• D. Biannually

Answer: (C)

Ensuring a reliable seal with tight-fitting negative-pressure respirators is essential for protection. Fit testing—whether qualitative or quantitative—verifies you can achieve the proper seal with the chosen respirator. The standard requirement is to perform this testing initially and then at least once every year. This yearly interval helps catch changes in facial features, weight, or wearer's fit that could affect seal effectiveness. If you switch to a different respirator model or experience significant facial changes, you must re-test before using the respirator again. Frequencies like daily, monthly, or biannually are not the standard minimum.