Check the listing for details. NORDFAB 8010002306 Manual Blast Gate,8" 40D609. Condition: New. Listed at 142.89 USD. 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 Quick-Fit(TM) Manual Blast Gate from Nordfab Ducting . has a rolled edge on the ends which provides easy connection to other components with use of a barrel-type clamp. A specially designed gasket inside the clamp seals the joint tightly. Simply and quickly clamp each piece together without welds, bolts, screws, flanges, special tools, or precise measurements. O.