SCHOFIELD, Wis. — 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. The addition of a low-leakage volume control damper to an automatic balancing damper allows the ABD-Z1 to shut-off unoccupied zones. By only ventilating targeted spaces, the central fan’s energy consumption is minimized. The ABD-Z1 is ideal for use in apartments and condos, bathroom ventilation, education buildings and dormitories, hospitals and clinics, hotels and motels, and nursing homes and assisted living facilities. For more information, visit