Damper Kit Motorized 8" Round, Volt:24, Hertz:50/60, Watts:6.5, Construction:22 Gauge Galvanized Steel, Linkage:Aluminum Shaft, Delran Bushings, Torque:35In-oz to 55 In-oz, Temperature Rating:0F to 120F Operating, Humidity:5 to 95 Non-Condensing, Damper Timing:Nominal 30Sec Powered, 8 Sec Spring Return, Connection:4" Wire Leads, Static Pressure:1"W.C. Weight:4 Lbs 5.0oz, Made in USA