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. It's made of galvanized steel and can be installed with sheet-metal screws.
Galvanized-steel construction
Creates an in-line transition between a round pipe or insulated-flexible duct to a rectangular stack or riser duct
Installs with sheet-metal screws
Insulate ductwork for system efficiency and comfort
Seal seams with code-approved mastic， sealant or duct tape (not included)
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