The very first thing you need to do is utilize the search feature within the forums, or use Google.

Failing that, I'll give you a link.

Computer Fan Wiring - Growing Marijuana

edited to add: go to a thrift store, like Goodwill. Cheap adapters.
Mrs. Greenjeans Reviewed by Mrs. Greenjeans on . Fan question! Hi im new to growing and i was just wondering how ur supposed to connect a 9v or 12v computer fan to run outside of a computer? What do i need to buy/connect..to start a computer fan? Thanks Rating: 5