Blast Gate For Nominal Duct Diameter 12 in Inlet Diameter 12 in Body Material Aluminum Overall Length 5 1/4 in Product Type Manual Blast Gate Weight 13 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 in Overall Width 13 1/4 in Shape Rectangular Inside Diameter 12 in Color Silver Connection Type Clamp Together