Quote Originally Posted by Sonya610 View Post
That is a great idea and those little computer fans are made to run constantly for years! I have an old tower now that is broken, can I just pull the fan and power supply out and plug it in? I am unsure about the power supply part.
Using the power supply isn't necessary. It just needs to be wired to a DC current matching the approximate specs on the fan, usually 12 volt and less than 1 amp. It doesn't have to match exactly. Lower voltage just makes in run slower, higher voltage, faster. If you have any old dc converters lying around that you don't need (I always keep them even if the device is broken/lost, etc) use one of those. For example I have a 12 volt, 1amp one that used to power a scanner. It will run two 12 volt / 0.5 amp fans.