| My HVAC Company use Hess fittings to connect vertical ducts that runs in the chase up to the platform of the second floor or to the attic with horizontal ducts in the basement:
  If a horizontal duct sits next to the basement's wall then they may use a right or left-handed Hess fitting, otherwise it could be a centralized Hess fitting.
 
In the pictures above you can see how this installation was finalized.
Hess fittings could be made almost of any size and shape it could be square on one end and rectangular on the other:
 
Left-Handed Hess Fitting
 Or it could keep the same size for the inlet and outlet.
Here are some voices from the web:
"If you laid that out on your own and did it all by hand hats off to you. That is not an easy fitting to lay out, compared to a regular flat or vertical elbow. The heel on those is tricky especially when you need one side to be flat. I just used two last week to bring my ductwork up through the floor in to a mechanical room where there will be a Ruud 95% single stage with 3 ton 14 seer but anyway the only other way would have been to cap and tap but no way with supply trunk."
"That fitting can be handy in a lot of instances. I was building one once and my boss walked by and said "hey you building a piano" of course I replied "nope just an airplane". I guess I was taking a little to long. I like to brake a kink kitty corner on the angled side. It seems to fit into the pits a little better."
"let me tell you that I made a lot of these pieces, we call them airplanes, goldbergs, and reverse boots. I made them a lot because I just happen to bump into situations where I needed a transition 90, but had no throat room..."
In this photo you can see how Hess fitting is used in the commercial application. The ductwork is designed and installed for the kitchen hood in restaurant at the Kalahari Water Park.
OK, I hope you understand that in many ductwork installation situations it could be a very useful fitting and you can make it at your shop, basement, garage or even on a job-site without heavy and expensive equipment using only your hand tools.
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