SS Motrzd Vent Dampr 8.1 In.L 12.9 In.H 8.1 In.W For Nominal Duct Diameter 8 in Damper Application Vent Number of Panels Not Applicable Overall Height 12 7/8 in Overall Length 8 1/8 in Rough Opening Shape Not Applicable For Duct Shape Not Applicable Overall Width 8 1/8 in Frame Material Thickness 0.024 in Blade Material Stainless Steel Maximum Air Pressure Not Applicable Overall Diameter 8 in Rough Opening Length Not Applicable Rough Opening Width Not Applicable