16" 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:18"H X 16"W X 16"D, In Mfg Box, Made in USA. (Alt E50500R80Ct16)