12.8 In.H-W 14.5 In.L Squ Mtrzd Contrl Dampr, For Nominal Duct Diameter 12 in, Damper Application Motorized, Number of Panels 1, Overall Height 11 3/4 in, Overall Length 14 1/2 in, Rough Opening Shape Square, For Duct Shape Square, Overall Width 11...