Vent Cap For Nominal Duct Diameter 3 in Gas Appliance Category Category I For Duct Height Not Applicable For Duct Width Not Applicable Inlet Diameter 3 in Material Aluminum Overall Length 6 3/4 in Product Type Vent Cap Inside Diameter 3 in Material Thickness 26 ga Weight 0.4 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 2 7/8 in Shape Cap