Why is fit testing particularly important for N-95 respirators?

Fit testing is crucial for N-95 respirators because it directly impacts the effectiveness of the respirator in protecting the wearer from airborne contaminants, including viruses, bacteria, and particulate matter. N-95 respirators are designed to provide a tight seal around the face to ensure that the air inhaled passes through the filter material rather than around the edges of the mask. An inadequate fit can lead to leakage, which significantly reduces the respirator's protective capacity.

When a proper fit is achieved through fit testing, the respirator can effectively filter out a high percentage of airborne particles, thereby minimizing the risk of inhalation exposure. This is particularly important in situations involving exposure to hazardous biological agents or environments, where the integrity of the respiratory protection can be a matter of health and safety.

While other aspects, such as regulations and comfort, are indeed relevant to the use of N-95 respirators, the fundamental reason fit testing is emphasized is due to its vital role in ensuring that the respirator performs as intended, thereby ensuring the user's safety and health in potentially hazardous conditions.