What is the primary purpose of fit testing for N-95 respirators?

The primary purpose of fit testing for N-95 respirators is to check for proper seal and fit. This process is crucial for ensuring that the respirator forms a tight seal around the wearer’s face, which is essential for effective protection against airborne pathogens and particulate matter. A proper fit ensures that the respirator works as intended, preventing contaminated air from leaking in through gaps.

Fit testing evaluates how well the respirator fits a specific individual's face shape and size, considering factors such as facial hair, changes in facial contour, and movement. Regular fit testing is a vital component of respiratory protection programs, especially in environments where there's exposure to hazardous substances or infectious agents.

While comfort is important for sustained wear, it is secondary to achieving a secure fit. Testing for chemical resistance and determining manufacturer specifications focus more on the materials and design of the respirator rather than on how effectively it protects the wearer through a proper fit. Thus, ensuring a proper seal is the most critical aspect of fit testing.