Someone may have posted something like this already, but this sounds similar to what you already have:
https://www.homedepot.com/p/Hampton...Ceiling-Fan-with-Wall-Control-52860/204507386
These move 9600 CFM on high, and they come with an adjustable speed wall switch and plate.
Something you should consider is, your garage is 36x50x16, or 28,800 cubic feet.
One of these fans would turn over your entire garage volume of air exactly 20 times in one hour (this is more than most commerical building HVAC requirements, subject to the room usage of course).
If you wanted something that you didn't want to blast on high all the time for that amount of airflow, I'd suggest getting two or three of them and running them lengthwise down the shop, evenly spaced, or four in a sort of rectangle pattern.
Should be more than adequate and extremely affordable.