If you put the motor IN the tower, you're going to be ****ing up a whole slew of components, most notably the Hard Drive, which is VERY sensitive to magnetic fields. Electric motors create electromagnetic fields around them, but motors used in computers are very small and low power, thus creating a very, very small magnetic field. You're talking about a 12" fan. You WILL be damaging your computer by putting that motor anywhere near your motherboard and hard drives. I can garuntee that.