Blast Gate For Nominal Duct Diameter 8 in Body Material Steel Overall Length 20 in Product Type Manual Blast Gate Weight 14 lb Maximum Pressure Rating Not Applicable Blade Material Galvanized Steel Maximum Temperature Rating 300 Degrees F Nameplate Voltage Not Applicable Number of Air Cylinders Not Applicable Seal Material Not Applicable Maximum Operating Pressure -30 in wc Minimum Operating Pressure Not Applicable Minimum Pressure Rating Not Applicable Overall Depth 6 1/8 in