Quote Originally Posted by jhovel View Post
What about a thermostat on the spindle itself, switching the fan on only when needed - irrespective of rpm?

Cheers, Joe
I like this idea the best. The fan is needed when temperatures rise, not simply because of RPM. I haven't looked for a solution, but it seems like it might be simpler. There might be a ready made solution to control an attic fan.

Steve