> They keep the machines cool with an evaporative cooling system. Its basically a durable paper product that looks like the wavy corrugated part on the inside of cardboard. Water is pumped to the top and flows down, and the fans blowing outwards on the other side create negative air pressure, drawing fresh air through the holes and cooling it.

The cardboard cooling system looks pretty interesting, but I wonder how durable it is: cardboard which is constantly wet doesn't sound like it'll last too long.