It could probably be wired into your power supply, which would need a switch (or a light dimmer) to turn it on and off. This would also require you to open your power supply, and that would void any warrantee. I would just go with a 12v 120mm fan or 2, gonna make much less noise and should cool your case well. That kind of fan (used to use one) will circulate air well in a small room (im guessing this fan is about 4 - 4 1/2 inches?)
Might be a bit of overkill, but its up to you. Just be careful messing with house current, and let us know how things turn out if you do!
<A HREF="http://tekkoshocon.com/" target="_new">http://tekkoshocon.com/</A> Southeast Pennsylvania gets an Anime Convention!