That was a great link, but you can do it without soldering. Just twist the wires together and use electricians tape or even hot glue. He also mounted it out of the viv, which is nice and clean. I've done it both ways, and inside is easier.
Step by step instructions:
1. Get a computer fan. you can either pull one from an old computer, or buy a new one online. I like the 90 or 72mm clear ones. You can get moisture resistant ones, but I have had good luck using regular ones.
2. Pick a cell-phone charger or wall-wart. If you look at the printing on it, it will say, "Output: 5.0V == 550mA," or whatever it is rated at. The fans are meant to run full output at 12v, but will run fine, just half-speed at 5v. (One of my viv's that has good outside air-exchange stays totally condensation free at 5v. Another one has minimal outside air exchange and needs to run at 12v to be clear, and still fogs up a bit when the lights are off.)
3. Then strip the wires from either the fan or the wart and put the wires together. This is low voltage, so you won't get shocked. the fan will only run if the wires are correct, so if it doesn't run, switch the connections and it will.
4. If you are mounting it in the tank and have frogs or lizards in there, put a screen on at least the intake side of the fan.
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