› 1pack-dayton-4hx68-damper-roof

29 In.H-W 4.5 In.L Aluminum Backdraft Damper Damper Application Backdraft For Nominal Duct Diameter Not Applicable Frame Material Galvanized Steel Number of Panels 1 Maximum Air Velocity 2250 fpm Overall Height 29 in Rough Opening Diameter 27 1/2 in...