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I have a set of the Troyer fans that I bought form another member, and after a lot of homework, bought the new Spal programmable VS controller to run them. IMO, the money goes to the controller and quality wiring and connections. I do like the quieter S blade fan though.
There's a group of guys in CA at a1electric.com that were pretty helpful for me as I tried to brush up on fans much like you are. I think I spent a couple of hours total phone time on this subject and they kept having the best no nonsense answers. Good luck.
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