I thought I would share my find. I am almost finished building a version of the L-Shapped Kegger bar and have installed a fan in my keg box that is turned on and off by a digital controller that also displays the temp. This is great as I can view the temp inside the box without opening it and control the fan! Here is the link: http://www.coolerguys.com/840556082491.html
It can control up to 4 12v fans and it comes with an AC power adapter so you don’t have to run an old PC power supply. I’ll post some pics if anyone is interested.