18" Diameter Wired Modulating Damper w/Actuator, 24 VAC, 80 In-oz of Torque, 2.4VA Operating, 1VA Holding, 5/16" Diameter Die Cast Shaft, No Internal Gasket to Restrict Airflow, LED Indicators for Fully Open, Dimensions:20"H X 18"W X 18"D, In Mfg Box, Made in USA.(Alt E50500R80Ct18)