Round Stack Boot 12" X 3.25" X 6"- is Compatible with Duct 6" Height_12in the gap will expand and

the gap will expand and retract to meet perfect air supply needed

this piece is a perfect touch of class you need to add to your decor

flush appearance when closed

+ Product Details Perfect Fit & Easy Sizing - Designed for a 18" x 12" OR 12" X 18" duct opening (measured at the opening)

and 4-way configurations

Round Stack Boot 12" X 3.25" X 6"- is Compatible with Duct 6" Height_12in the gap will expand and+ Product Details Size The size of a galvanized sheet metal stack boot is 12" X 3. 25" X 6". It is compatible with duct 6". Design The stack boot at the bottom of the stack allows a transition from an ordinary large round or rectangular duct to a thin wall mounted duct. Applications The straight boot is used for a straight line transition going from round pipe or insulated flex duct to wall stack. Premium Quality Our straight round stack boot is made