My PC (under desk in closet)
PC case under my desk. Side is off to allow better airflow and venting. Notice the fan 'floating' in the middle of the opening? It's strapped by 5 thin wires (stripped from a CAD5 network cable) which are twist-tied to the 4 corners of the case. The 5th wire (horizontally strung) puts extra tension on the fan and keeps it from wobbling around like crazy. It's a mess, but it gets the job done!