What is the purpose of the fit check when using a respirator?

The purpose of a fit check when using a respirator is to ensure that the device forms a tight-fitting seal against the user's face, preventing any unfiltered air from entering the respirator. This is vital for ensuring the effectiveness of the respirator in protecting the user from hazardous airborne contaminants. A proper seal allows the respirator to function as intended, filtering out harmful substances and providing a safe breathing environment.

While comfort is important for prolonged use, it does not determine the effectiveness of the respirator. Confirming the mask's appearance is not related to its protective capabilities. Additionally, testing the respirator's durability is more about its longevity and quality, rather than the immediate functionality and safe usage in a working environment. Therefore, checking for a tight-fitting seal is critical to ensure that the respirator operates efficiently and protects the user from potential exposure to harmful agents.