What is the purpose of a fit check for respirators?

The primary purpose of a fit check for respirators is to verify the correct size and seal each time they are used. This procedure is crucial because a properly fitted respirator ensures that there are no gaps between the mask and the wearer's face, which could allow contaminated air to enter the breathing zone. A good fit is essential for the respirator to provide adequate protection against airborne contaminants, such as asbestos fibers.

Regular fit checks, typically done through simple procedures that involve inhaling and exhaling while wearing the respirator, help to confirm that the respirator forms a tight seal and functions as intended. This is particularly important in environments where hazardous materials are present, as it directly impacts the safety and health of the worker.

In contrast, the other choices focus on different aspects of respirator use. Cleaning the respirator ensures hygiene but does not guarantee a proper fit. Assessing filter efficiency is important for understanding protection levels over time but does not address immediate fit issues. Measuring ambient air quality relates to the surrounding environment, rather than the individual fit of a respirator to a user.