Acme Miami 95012 12 in. Motorized Damper - Silver 2-wire spring return dampers 24 Volts AC actuator: Dia: 12".Position: N/C. Power Open. Increased Torque. Quieter Operation. Country of Origin: USA. Dimensions: 14.25"Lx14.25"Wx14.75"H. Weight: 7.1 lbs.