11.75 In.H-W 3.7 In.L Squ Gravity Fire Dampr, Damper Application Fire, Frame Material Galvanized Steel, Number of Panels 1, Maximum Air Velocity None, Overall Height 11 3/4 in, Rough Opening Diameter Not Applicable, Rough Opening Shape Square, Fits Fan...
11.75 In.H-W 3.7 In.L Squ Gravity Fire Dampr, Damper Application Fire, Frame Material Galvanized Steel, Number of Panels 1, Maximum Air Velocity None, Overall Height 11 3/4 in, Rough Opening Diameter Not Applicable, Rough Opening Shape Square, Fits Fan...