TB6600 40mm Fan Case

This is a case for the kind of crappy TB6600 stepper driver controller. Like the one sold here: http://www.ebay.com/itm/CNC-Single-Axis-TB6600-0-2-5A-Two-Phase-Hybrid-Stepper-Motor-Driver-Controlle-F5-/291714731792?hash=item43eb8d8f10:g:e6oAAOSwxvxW70iX

These drivers can be greatly improved by my posts on this cnc forum.
http://forum.planet-cnc.com/viewtopic.php?f=9&t=1107#p13517

These improvements include the requirement of a fan (in this case a 40mm fan). Any fan should work for this c