Make an offset plane to represent the length of the transition.
How to make a sheet metal transition for a furnace.
The gap is for the sides of the flat sheet.
A transition can also be created to adapt a return air plenum when installing an air cleaner.
Open a sketch on the offset plane.
In the picture on the left you can see a real furnace plenum and cold air drop.
A transition between a furnace and plenum you can purchase below.
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The rounded corners are to help accommodate the transition to the circle.
The kits contain sheet metal pieces and an instructional dvd video to show you how to make sheet metal transitions.
A sheet metal transition is a custom fabricated duct to connect a new furnace or air hander to existing ductwork.
In 2002 alpine home air products became the first company to sell heating air conditioning and indoor air quality products online.
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.