Hi,
I'm not quiet sure if I understood you well. If you want the fan to be controlled based on thermal environemnt/temps, then you need a special fan with a thermo-doide. If this is the case, you can check some big online shops, they usually have it. Some fan controllers have flexible con trolling based on temps, I can only think of one yet, but need to check what was the name again.
Greets,
Andy
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