22" X 8" Truezone Automatic Rectangle Zone Controlled Motorized Damper, Voltage:24 Volt Spring Return Motor, Hertz:60, Watts:8, Amps:0.6, Ambient Temp:40 Deg F to 140 Deg F, Time Delay:38 Seconds Power Open/10 Seconds Spring Return, Material:Extruded Aluminum, Dims:8"H X 6"W X 22"D, Weight:8 Lbs, Origin:Mexico, In Mfg Box.