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