My mining rig is a cardboard box (but it's that GOOD quality cardboard).

I cut vents in the sides, and sliced out a viewing window on top with a piece of plexi-glass taped over it (to avoid an Schrodinger's cat mysteries with the stuff inside).  Then I cut a crude hole on top and I have an "O2Cool" fan sitting on top of that.  You can buy these fans at Wal-Mart in the States for about $6.00.  They are USB powered, but come with a USB power adapter (only 500ma, so not good for much else).  It moves a decent amount of air for what I paid for it.  Keeps things pretty cool in there.

[img]http://i.imgur.com/jEQsvGI.jpg

And inside of the box?  Just a said little $15 USB hub, that will be maxed out on power if I ever add a fourth block erupter.

[img]http://i.imgur.com/ppHXEUP.jpg

It's a power house I tell you.