Master Flow 10 in. x 3-1/4 in. to 4 in. Stack Boot

This Master Flow 10 in. x 3-1/4 in. to 4 in. Stack Boot can be used to create a transition between different pipes and ducts. Ideal for in-wall duct applications. It's made of galvanized steel and can be installed with sheet-metal screws.

• Allows a smooth transition between rectangular and round ducts
• Galvanized steel design protects the stack boot from corrosion
• Ideally suited for all HVAC air venting systems