I got the same results. Even the air coming out of the back vent over the graphics card was much cooler with a fan blowing down the main vent. On Tuesday, November 26, 2002, at 03:57 AM, Bill Bradford wrote: >> a comment below about blowing air 'down' the chimney is wrong. this >> is fighting the natural convection, which causes hot air to rise, so >> it would be fighting nature. > > Say what you may, my tests show the opposite. My system stays at a > constant 20-24C with a fan blowing air down from the top, versus > 28-32C with a fan blowing up from under the cube: > > http://www.mrbill.net/newcam/test/tn/newcam.jpg.html