I have a denon 2802. The problem is it does not fit in my rack. A relative works for a furniture company and she can get me some nice stuff. The problem is that denon say that there should be 10cms ventilation space above and behind the amp. Is this VERY important or is it just denon being careful. If so is there another size that I can suggest to her to see if she can find someting. I don't want to bust my amp by overheating it.