> " I'm thinking if I can build one with 8" dryer ducting or larger and
> figure out a way to make it smooth"
>
I made a perfectly smooth toroid by covering aluminum dryer duct with joint
compound then sanding it smooth and covering it with aluminum HVAC tape.
You will need to apply a coat of primer over the joint compound otherwise
the tape will not stick.
The whole process is a little time consuming and keeping the tape from
kinking or rippling is tricky but in the end its the most cost effective
solution.
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