Allegro Y-duct connectors are constructed of industrial grade galvanized sheet metal which distribute airflow in multiple directions. They are available in different sizes to fit standard 8 / 12 / 16 / 20 inch circular ducting. They comfortably connect to ducting with the help of a standard ring clamps and allow you to vent several areas with one fan. They feature heavy-duty pre-crimped construction for quick installation. Choose from a range of these Y-duct connectors, available in 12 and 18 inch outlet sizes.