Unfortunately, the "convection" cooling does not work nearly as well as it does in the slot load G3 iMacs. It draws air in from the sides and that air rises up the sides as it gets heated and exits through the handle when it reaches the top, but it is as equill said, there is a huge area in the middle that gets missed by the flow of air entirely. Many a compact has succumbed to the ravages of heat build up because of Jobs decision not to have a cooling fan. I only run mine for occasional testing as I don't have any fans to keep them cool or I would use them a bit more.