This Broan® Wall Vent Ducting Kit is the perfect easy-to-install vent for a kitchen or bath ventilation fan. It will work with 3" 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. diameter flexible foil ducting, 4 in. metal duct connector, 3-4 in. duct adapter, 2 nylon zip ties and 4 mounting screws. The flexible ducting conforms to UL 181 Class 1 Air Connector requirements.
