Vent Cap For Nominal Duct Diameter 4 in Gas Appliance Category Not Applicable For Duct Height Not Applicable For Duct Width Not Applicable Inlet Diameter 6 in Material Aluminum Overall Length 14 7/8 in Product Type Vent Hood Inside Diameter 3 in Material Thickness 19 ga Weight 6 lb Maximum Pressure Rating Not Applicable Maximum Temperature Rating Not Applicable Seal Material Not Applicable Standards ANSIZ21.47 NFPA211 NFPA54 Finish Not Applicable Color Silver