Why is it important to conduct a fit-test for a respirator?

Conducting a fit-test for a respirator is crucial because it confirms that there is no leakage during use. A properly fitted respirator creates a secure seal around the wearer's face, which is essential for ensuring that the air being inhaled is filtered and free of harmful contaminants. If there are gaps or leaks in the respirator, unfiltered air can enter, potentially exposing the wearer to hazardous substances. Thus, a fit-test verifies that the respirator is effectively protecting the user by ensuring that it fits snugly and securely.

While comfort is important for the wearer's willingness to use the respirator, and measuring efficiency gauges the overall performance of the respirator itself, neither directly addresses the critical concern of containing contaminants. Checking the expiration date is also necessary to ensure the device’s integrity, but it does not relate to the proper fit or seal of the respirator during use. A fit-test focuses specifically on achieving that crucial seal needed for safety against airborne hazards.