A sheet metal transition is a custom fabricated duct to connect a new furnace or air hander to existing ductwork.
How to make a sheet metal transition for a furnace.
The gap is for the sides of the flat sheet.
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Start with a rectangle with fillets in the corners and a gap in one side.
The kits contain sheet metal pieces and an instructional dvd video to show you how to make sheet metal transitions.
The rounded corners are to help accommodate the transition to the circle.
This can be smaller than shown in the image.
How to make transitions from your new furnace to old plenum and from cold air boot with hand tools in the example above i took a hypothetical furnace and plenum and made a transition.
A transition can also be created to adapt a return air plenum when installing an air cleaner.
Make an offset plane to represent the length of the transition.
Open a sketch on the offset plane.