Computer PC Fan For Ventilation

ok I have came to the conclusion that a few PC fans will be a sufficient ventilation method for my first grow room. My only question is, how do I power the fans? Will i need a computer PSU or are there other methods?

Chears.

Theres a DIY section in these forums. In there you should find guides on how to battery and outlet power computer fans. Otherwise you use the molex connectors on a computer power supply and jump it with a bobby pin. (old ones dont need to be hotwired)

I've ghetto wired them with phone chargers many times, but only on small boxes, flouros only. Not strong enough for the 600w HPS flower cab.

go buy a multi voltage adaptor/charger, the ones where you select between 12v 8v 6v 3v... and much sure it gives off at least half an amp. Their usually pretty cheap and you can use them a fan speed controller (by giving the fans a lower voltage).
that's the best way to do it...

most computer case fans are 12v, and usually under half an amp. You could probably find a 12v adapter in your junk drawer in your kitchen. Trust me, go look...now! Make sure it's 12v! That 9v adapter will under power it. Now cut the end off and connect the wires.

If your fan has 3 wires (prob yellow red black), use the yellow and black. The red is for 5 volts and you should just ignore it. After you connect your wires, plug it in. If it doesn't work, reverse the wires and try again.

You can use adapters from old electronics, cell phones, some laptops, or you can buy one from Radio Shack for about $12 or so.

Once you have it working, solder and tape or use small wire nuts. Insulate!!!

How big is your grow room? Most case fans barely manage to keep the inside of a computer case cool. My veg box is under 40 cubic feet and my fans are probably pushing 200-250 cfm easy.