Computer fan.
Cut off the end. There will be a black, red, blue, and yellow...just ignore the blue and yellow.
Get a cell phone charger.
Cut of the end. There will be a red and black wire.
Put on some heat shrink stuff. Then connect the two. Red to red. Black to black. Put some electrical tape over each connection, then use the heat shrink. Then wrap it all in electrical tape.
Mount the fan, plug it in and you're good to go! It's really easy and I'm sure most people have at least one old cell charger laying around...
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