Model ABD-Z1 is the latest addition to Greenheck’s line of automatic balancing dampers that provide on-demand control to ventilation systems. Model ABD-Z1 combines a shut-off damper with an electric actuator, automatic balancing damper (ABD) and a plenum box into one assembly. Allows the ABD-Z1 to shut-off unoccupied zones, minimizing energy consumption. Ideal for bathroom ventilation, education buildings and dormitories, hospitals, clinics and hotels.