Yes, it certainly helps make the Ultra-120 a more efficient cooler when one hooks up a fan to it. I believe that it's this one:Originally posted by: Baked
How do you listen to your friend's Ultra-120 when doesn't come w/ a fan? Do you know what 120mm fan your friend's using on his Ultra-120?
http://www.zipzoomfly.com/jsp/ProductDetail.jsp?ProductCode=373507
but I'm not totally sure. If you are really curious I can try to remember to ask him.