3 in. to 4 in. Roof Vent Kit for Round Duct Steel in Black Sku: BRO-RVK1A-HD This is a brand new part comes with a full manufacturer warranty!!! This sale transaction is for only this part number: RVK1A The RVK1A Steel Roof Cap Kit is an easy-to-install vent for ventilation fans (bath, rec room, home gym, etc.). It is compatible with 3" or 4" ductwork and includes a 3" to 4" adapter for convenience. This cap features both a back draft damper and bird screen, preventing outside air from entering the home and birds and small pests from entering duct work. This kit includes all materials needed for installation, including 8 ft. of 4" flexible ducting, 4" metal duct connector, 4" to 3" Reducer, nylon zip ties and mounting screws. The flexible ducting conforms to UL 181 Class 1 Air Connector and CUL S110 requirements. Not suitable for dryer venting or flat roofs. Features: Broan-NuTone Bathroom Exhaust Fans Built-in backdraft damper prevents outside air from entering home Built-in bird screen prevents birds and other small animals from entering duct work Kit includes all materials needed for install: 8 ft. of 4" flexible ducting, 4" metal duct connector, 4" to 3" Reducer, nylon zip ties and mounting screws Constructed of durable, resilient steel with a black powder coat finish Easy to install in new construction, replacement, or DIY applications Compatible with 3" and 4" round ducting Not suitable for dryer venting or flat roofs TERMS OF SALE: If, after receiving this item you discover that it was not the one you wanted, simply return it for a full refund within 30 days. You will have to pay for the return shipping charges. Refund is void if you have installed, used or damaged the item in any way. Item must be returned with its original box, packing materials and instructions. Payment via PayPal must be received within 3 days of transaction and prior to shipping. SHIPPING: Shipping charge will be based upon location. Please use the shipping calculator or request a shipping quote. International buyers: Customs fees, duties, taxes, tariffs other fees are your responsibility. Arrival time will depend on your location. If you have any questions, feel free to ask. Thank you for visiting! Weight:8.0000~SCID:122909~Dimension:11.000x6.000X13.000