Periodic testing of life-safety systems and dampers is required by fire codes. While there is some state or local variation, the requirements are essentially the same in all of the U.S. Although, the focus of this article is on the dampers, the entire smoke control system is required to be periodically tested, and doors and any other fire and smoke protectives must also be tested. A clear distinction must be made among the dampers and applications to determine the schedule that conforms to codes.