Updated picture of my mining shelf, both the Avalon6 and S5 (hiding in the back) live here together now.  S5 is powered by 850W atx psu, A6 by 1200W HP server psu (fed from dryer 240v outlet).  Vent in wall provides cool air for intake, or I vent the S5 out of it.  There is also a window on that wall that I open to give more cool air.