Butterfly Dampers For Nominal Duct Diameter 12 in Overall Length 13 in Product Type Butterfly Valve Weight 8.4 lb Maximum Pressure Rating 42 in wc Maximum Temperature Rating 225 Degrees F Material Thickness 20 ga Material Stainless Steel Minimum Pressure Rating 2 in wc Shape Round Inside Diameter 12 in Outlet Diameter 12 in Overall Height 12 in Overall Width 12 in Color Silver Connection Type Clamp Together For Media Type Dust Environment Type Dusty