Duct Reducer For Nominal Duct Diameter 4 in 12 in Inlet Diameter 12 in Inside Diameter 12 in Overall Length 16 in Product Type Reducer Weight 3.75 lb Material Thickness 22 ga Maximum Pressure Rating 42 in wc Maximum Temperature Rating 1 100 Degrees F Material Stainless Steel Seal Material Nitrile Standards Not Applicable Shape Round Gas Appliance Category Not Applicable Maximum Airflow 5 500 cfm Outlet Diameter 4 in Overall Height 16 in Overall Width 12 in End Type Quick-Fit