Marketing InformationThis BROAN® wall vent ducting kit is the perfect easy-to-install vent for a kitchen or bath ventilation fan. It will work with 3 in or 4 in ductwork and includes a 3 in to 4 in adapter for convenience. The kit comes with all parts need for installation, including 5 ft of 4 in Dia flexible foil ducting, 4 in metal duct connector, 3 to 4 in duct adapter, 2 nylon zip ties and 4 mounting screws. The flexible ducting conforms to UL 181 class 1 air connector requirements.