Blast Gate For Nominal Duct Diameter 8 in Inlet Diameter 8 in Body Material Aluminum Overall Length 5 1/2 in Product Type Manual Blast Gate Weight 5.5 lb Maximum Pressure Rating 42 in wc Blade Material Galvanized Steel Maximum Temperature Rating 390 Degrees F Body Material Thickness 22 ga Overall Depth 5 1/2 in Overall Width 9 1/4 in Shape Rectangular Inside Diameter 8 in Color Silver Connection Type Clamp Together