29.75 In.H-W 4.5 In.L Aluminum Backdraft Dampr Damper Application Backdraft For Nominal Duct Diameter 30 in Frame Material Galvanized Steel Number of Panels 1 Maximum Air Velocity 2000 fpm Overall Height 29 3/4 in Rough Opening Diameter 30 in Rough Opening Shape Square Fits Fan Diameter 30 in For Duct Shape Square Free Area 6 sq ft Overall Width 29 3/4 in Frame Material Thickness 20 ga Overall Length 4 1/2 in Frame Depth 2 in Rough Opening Length 30 in Maximum Pressure 1 in wcMRO3HHL8
| # | Attribute | Value |
|---|---|---|
| 1. | brand | DAYTON |

