If you have built a huge gaming rig or something packed with the latest graphics cards and processors. Heat is always going to be a consideration when buying fans or opting for water-cooling.
However Truly Epic Casemods have created a fantastic case modification using a off-the-shelf fan controller. Check out the video after the jump.
Using one off-the-shelf fan controller, servo motor and Arduino board, plus some water-cut styrene parts user SXRguyinMA outfitted his NZXT Tempest Evo case with a auto vent cooling system.
Once the temperature is detect above a certain temperature the vents open and close to let out heat. It also has a pair of super capacitors fitted that can store enough power to close the vents even if power is lost.