Fans

[mjveld1018]

That's true, most fans are designed to be used a certain direction, but I would think they'd still reverse and be less effective. I haven't used them in a few years though.

If your motors/gearboxes have good airflow I would think they would be okay, but if you still feel like you need fans, as long as they are positioned in such a way that they increase the airflow across the motor they will help. Know that you have to provide power separate from the motor power for these. Typically a relay would be used here. I seem to remember hooking mine up directly to the PD board just to be always on, but I'm not entirely sure that's legal...