Originally Posted by Swanny

For fans its an edge to edge measurement. Motor fans are typically 30mm (except for the LRP one which is bigger). The LRP ESC uses a 25mm fan. The Novak brushless units I think use a 30mm fan.

I've just discovered the new, high output MuchMore fans - they move a lot of air. Anyone know what voltage they're rated for? I'm running my motor fans straight off the battery (which you have to in Australia) but I was wondering if that's too high for them?