Maximize the air and sound performance of your NuTone ventilation fan or range hood using one of our wide variety of ducting accessories.Sold as 1 to a carton Transition is made of 30 gauge galvanized steel construction for durability and long life 3-1 4 x 10 short eave elbow transition is made for fan and hood installationsDiameter: 4 Height: 9-1 4 Width: 11