Fan

This is a standard 40x40x10mm fan with a short USB cable that can be plugged into a Quadra USB port or Hub (recommended).  The short cable keeps the installation clean.  This fits in the Quadra Stand.

We have switched to a low-speed fan which is much quieter.  If you still have problems with heat, you may wish to source a different fan such as this one with variable speed control which lets you dial in as much cooling as you need at any given time.