Butterfly Dampers For Nominal Duct Diameter 4 in Overall Length 8 in Product Type Butterfly Valve Weight 1.65 lb Maximum Pressure Rating 42 in wc Maximum Temperature Rating 225 Degrees F Material Thickness 22 ga Material Stainless Steel Minimum Pressure Rating 2 in wc Shape Round Inside Diameter 4 in Outlet Diameter 4 in Overall Height 4 in Overall Width 4 in Color Silver Connection Type Clamp Together For Media Type Dust Environment Type Dusty Material Fabrication Rolled Edge