That's a great idea. I think that Apple designed the Cube around that very principle - convection cooling. How much more could be gained by an extended chimney sounds like a question for the thermodynamicly trained among us. (sorry I dropped out of engineering and went into business). Perhaps a 3 Mile island cooling tower style plexiglass chimney would do the trick! In a message dated 1/12/03 8:50:33 PM, Cube at lists.themacintoshguy.com writes: << Has anyone tried with a chimney? I remember, in the good ol' days of the MacPlus and before, there was a company that offered a chimney to mount on top of the Mac. The idea was to SILENTLY cool the computer with the airflow coming from from a tall pipe attached to the cooling-grill on top of the computer. This should create a stream of ascending (warm) air that would drive the whole thing. It looked silly (it was quite tall), but I'd gladly pay that price for silence1 /Peer >>