Join Date: Mar 2007
Location: Toronto, Canada
80mm computer fans generally work at 12v. I'm not sure about the current rating for each fan but both voltage and current ratings are important. You can probably go to radioshack or similar and buy a DC adapter with a voltage rating of 12v and lower. Now for the current rating, say your fan each use up 200mA, you'd need a DC adapter that has at least 400mA, 500mA to be safe.
To connect them, just the positives, probably a colored wire, together and the negatives together, most likely a plain black wire.