6 in dia Round Motrzd Balancing Damper For Nominal Duct Diameter 6 in Damper Application Control Number of Panels Not Applicable Overall Height 11 in Overall Length 6 in Rough Opening Shape Round For Duct Shape Round Overall Width 6 in Frame Material Thickness Not Applicable Blade Material Galvanized Steel Maximum Air Pressure 4 in wc Overall Diameter 6 in Rough Opening Length 6 in Rough Opening Width 6 in Damper Type Dynamic Maximum Air Velocity 3000 fpm