What is the purpose of a fit check in regard to respirators?

The purpose of a fit check in regard to respirators is primarily to verify that the respirator is working correctly. This involves assessing how well the respirator fits the user, ensuring that it forms an adequate seal against the face. A properly fit respirator helps to ensure that the air inhaled is filtered and that contaminants present in the air do not enter the breathing zone.

Conducting a fit check can involve both qualitative and quantitative methods, aimed at identifying any issues that may hinder the respirator's performance. If the respirator is not functioning correctly—such as through an improper fit or structural defects—it may fail to provide the intended protection against harmful airborne substances. Thus, verifying that the respirator is working properly is crucial for the wearer's safety and health.