How often should fit testing for respirators take place?

Fit testing for respirators should be conducted annually, or whenever there is a change in the type of respirator being used, changes in the user's physical condition (such as significant weight loss or gain), or changes in facial structure (like dental work). Additionally, if the respirator fails during use or if there are concerns about the fit, retesting should occur. Regular fit testing ensures that the respirator provides the necessary protection and maintains compliance with safety regulations.