These zone dampers are the latest in design and were developed to fit field requirements for a variety of duct work shapes and sizes. These dampers use 24 VAC direct drive actuators for smooth, quiet performance. There is a 1/2 in. direct-drive mounting hub for securing the damper blade and shaft to the actuator housing. A position indicator and angular rotation stop for viewing or manually setting minimum maximum damper positions facilitate ease of installation. A spring loaded disengagement button to momentarily release main gear and damper blade allows for manual positioning of installed dampers. The damper motor and terminal block wiring are protected by a plastic cover with a removable door. Permanently lubricated bushings, with a split shaft design for round and rectangular style dampers, secure the damper blade to the shaft for efficient reliable service.