Duct Reducer 475B
This Broan 475B Duct Reducer reduces 6 inch air duct to a 4 inch air duct. This Duct Reducer comes in a pack of six. This Duct Reducer is easy to install when the instructions are followed correctly. This Duct Reducer corresponds with other parts like wall caps, air ducts, and elbows. This Duct Reducer can work with the Broan 406 air duct.