Broan-NuTone 415 changeable their beginning in 1932, Broan has pioneered numerous of the product innovations now set up as standards of the industry. Today, Broan on the commitment to provide the finest products in the industry.Broan-NuTone 415 changeable Elbow Features : Fan Accessories, Ducts, Transitions, Elbows 7 '' changeable Elbow Fits 7 '' crosspiece passage.