Final answer:
Employees using tight-fitting respirators must perform a user seal test each time they put on the respirator to ensure a proper fit.
Step-by-step explanation:
Employees using tight-fitting respirators must perform a user seal test each time they put on the respirator to ensure a proper fit. The user seal test involves covering the exhalation valve(s) and exhaling gently into the respirator to check for any leaks. If there are no leaks, the respirator is properly sealed and can be used.