Fit testing is performed when a respirator is issued to a worker.
Fit testing is also required when a different make or model of respirator is used. In addition, fit testing must be done whenever something happens that could affect the fit of a respirator. For example, fit may be affected if an employee's facial characteristic changes due to weight gain or loss. Fit testing is required annually for workers exposed to benzene and formaldehyde and semi-annually for workers exposed to asbestos, arsenic, lead, acrylonitrile. Fit testing must be performed by DEHS staff or other designated individuals.