Blast Gate For Nominal Duct Diameter 4 in Inlet Diameter 4 in Body Material Aluminum Overall Length 5 1/2 in Product Type Manual Blast Gate Weight 2.25 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 5 1/8 in Shape Rectangular Inside Diameter 4 in Color Silver Connection Type Clamp Together