Sorry, this needs to be cleared up. As you can see at the bottom of http://www.apple.com/imac/design.html the new iMac has blowers, not fans. Here's a link to describe the difference: http://www.electronics-cooling.com/Resources/EC_Articles/MAY96/may96_01.htm The blowers in the iMac (and in the Xserve, for that matter) are very carefully placed so that they push air through specific channels. If you look at the inside of the iMac case, you can see how they are channeling the air from particular blowers in particular directions. They cleverly combine convection and directed air to minimize the amount of blowing necessary. Anyway... no fans.