HVAC Zone dampers - heavy-duty, extreme reliability, Commercial-Quality. POWER OPEN, POWER CLOSE, 24VAC made in the USA by Ecojay SmartZone. Top quality high-torque motor from Belimo. Full-seal gasket blade, Professional Grade, Ribs for easy flex duct attachment, One crimped end for easy solid duct attachment, 5 Year replacement warranty.POWER open & POWER close (3 Wire) SPECS VOLTAGE: 24VAC POWER: 2.5VA MAX RUN TIME: 35 Second (90 Deg) TORQUE: 18 in-lbs Minimum Open and Maximum Close Set-Screws Easy push-button clutch for freely moving blade Sandwiched poly blade seal for ultra-low leakage PREMIUM Quality, super-duty and BEST construction MADE IN THE USA. Select 6 inch, 7 inch, 8 inch, 9 inch, 10 inch, 12 inch, 14 inch, or 16 inch round.