Duct Reducer For Nominal Duct Diameter 3 in 4 in Inlet Diameter 4 in Inside Diameter 4 in Overall Length 7 in Product Type Reducer Weight 1.25 lb Material Thickness 22 ga Maximum Pressure Rating 42 in wc Maximum Temperature Rating 390 Degrees F Material Steel Seal Material Nitrile Standards Not Applicable Shape Round Gas Appliance Category Not Applicable Maximum Airflow 615 cfm Outlet Diameter 3 in Overall Height 7 in Overall Width 4 in End Type Quick-Fit Color Silver