Something like this? Sound Construction IsoBox Studio with Mac Tray (20 RU w/Mac Tray) | Sweetwater.com
or this http://www.custom-consoles.com/isobox.php
Google around, there are different manufactures and designs.
As you noted......the importance of air flow......
fans, t-stat, design.
Can you relocate your equipment.......can you move it further from you and baffle or shield the direct "noise" yet keep area around the equipment open?