Burning Typhoon on 23 December 2011
Yes, never put the PS3 (or any electronic back in the box when you're finished. Actually, the fan will still run in most cases after you've power-downed the system.
Do not put them on carpet, and, All the heat's just going to travel inside the box while you're playing it. So, if you put it in that box (With all the heat already in it, it's not such a good idea.
Yes, fans will help, but, try to keep them out in the open. My PS3 sits by a window, So, it's good. You want to have space for the heat to escape, not build up, you know?
