16 india Nrm Opn Rnd Stel Zone Cntrl Dampr For Nominal Duct Diameter 16 in Damper Application Motorized Number of Panels Not Applicable Overall Height 4 5/8 in Overall Length 4 7/8 in Rough Opening Shape Round For Duct Shape Round Overall Width 16 in Frame Material Thickness Not Applicable Blade Material Galvanized Steel Maximum Air Pressure Not Applicable Overall Diameter 16 in Rough Opening Length 16 in Rough Opening Width 16 in Damper Type Dynamic