iO HVAC Controls EB-1812-BM 18 X 12 Heavy Duty Motorized Bypass Damper - Bottom MountiO HVAC Controls EB 1812 BM ACTUATORS ARE INSTALLED ON 2ND DIMENSION 18 x 12 Heavy Duty Motorized Bypass Damper Bottom Mount Height: 18 Width: 12 Total Size: 18 x 12 Actuator Placement on the dimension: 18 Additional Information Item NumberEB 1812 BM BrandiO HVAC Controls MotorizedYes ShapeRectangular Size (in)18 x 12 Spring ReturnNon Spring Return TypeBypass Dampers