Blast Gate For Nominal Duct Diameter 4 in Body Material Cast Aluminum Overall Length 6 7/8 in Product Type Manual Blast Gate Weight 1 lb Maximum Pressure Rating Not Applicable Blade Material Galvanized Steel Maximum Temperature Rating 300 Degrees F Nameplate Voltage Not Applicable Seal Material Not Applicable Minimum Operating Pressure Not Applicable Minimum Pressure Rating Not Applicable Overall Depth 1 7/8 in Overall Width 5 in Standards Not Applicable Inside Diameter 4 in