Browse our wide selection of small and big home and kitchen appliances designed keeping quality and reliability in mind. These home appliances are easy to use and make your everyday life much convenient and comfortable. Features For use with 3' or 4' round duct; 4' to 3' transition included ( not for use with dryer venting). Spring-loaded backdraft damper and bird screen. Made of .025 Aluminum in a natural finish. Compatibility 3 & 4 in. Round Duct. Specifications Finish: Aluminum. Cube: 1.06. Dimension: 1.09 H x 0.63 W x 1.55 L in.. Weight: 4.87 lbs.