Blast Gate For Nominal Duct Diameter 4 in Body Material Steel Overall Length 5 3/8 in Product Type Manual Blast Gate Weight 2.7 lb Maximum Pressure Rating 42 in wc Blade Material Galvanized Steel Maximum Temperature Rating 250 Degrees F Body Material Thickness 22 ga Overall Depth 5 3/8 in Overall Width 6 1/8 in Shape Rectangular Inside Diameter 4 in Color Silver Connection Type Clamp Together