Blast Gate For Nominal Duct Diameter 4 in Body Material Steel Overall Length 5 1/2 in Product Type Pneumatic Blast Gate Weight 9.9 lb Maximum Pressure Rating 42 in wc Blade Material Galvanized Steel Maximum Temperature Rating 150 Degrees F Nameplate Voltage 120V AC Number of Air Cylinders 1 Body Material Thickness 20 ga Minimum Operating Pressure 75 psi Minimum Pressure Rating 75 psi Overall Depth 10 1/4 in Overall Width 20 3/8 in Shape Rectangular Inside Diameter 4 in