Good point...but I'd like to use the fan I have. It's a 6 inch fan that i normally use full speed.
Even with the motor speed controller running at the lowest setting, it's actually keeping my cooltube in the winter too cool.
It's a very small box, and I would like to radiate a little more heat into my grow, without relying on external sources for it.
Figured bringing the speed down more would accomplish this.