Butterfly Dampers For Nominal Duct Diameter 8 in Overall Length 13 in Product Type Butterfly Valve Weight 4.1 lb Maximum Pressure Rating 42 in wc Maximum Temperature Rating 225 Degrees F Material Thickness 22 ga Material Steel Minimum Pressure Rating 2 in wc Shape Round Inside Diameter 8 in Outlet Diameter 8 in Overall Height 8 in Overall Width 8 in Color Silver Connection Type Clamp Together For Media Type Dust Environment Type Dusty Material Fabrication Rolled Edge