What is a primary purpose of fit testing for respirators?

The primary purpose of fit testing for respirators is to ensure a proper seal against contaminants. This process assesses how well a respirator conforms to the individual’s face, preventing air leakage around the edges. A proper seal is crucial because any gaps can allow hazardous substances to bypass the respirator’s filtering system, thereby exposing the wearer to potentially harmful airborne contaminants. Fit testing verifies that the respirator will provide the intended level of protection during use, enhancing safety for individuals in environments with toxic substances.

Other factors, such as comfort and user preference, are important for prolonged use but do not directly relate to the respirator's ability to provide a secure and effective barrier against contaminants. Additionally, determining the lifespan of a respirator involves different criteria focused on wear, damage, and effectiveness over time, rather than the immediate effectiveness of the fit.