Corridor is an enclosed exit access component that defines and provides a path of egress travel to an exit. Corridor dampers are intended for use as a fire/smoke damper where air ducts penetrate or terminate at the horizontal openings in the ceilings of interior corridors. Dampers may be installed with the actuator above or below the damper. Corridor dampers are combination fire and smoke dampers that have been evaluated for mounting only in specific corridor ceiling constructions.