Vent Cap For Nominal Duct Diameter 4 in Gas Appliance Category Category I For Duct Height Not Applicable For Duct Width Not Applicable Inlet Diameter 4 in Material Aluminum Overall Length 6 3/4 in Product Type Vent Cap Inside Diameter 4 in Material Thickness 26 ga Weight 0.5 lb Maximum Pressure Rating Not Applicable Maximum Temperature Rating 470 Degrees F Seal Material Not Applicable Standards UL Listed Finish Uncoated Color Silver Overall Height 4 1/4 in Shape Cap