LOL  

If you were to see what I'm up to you would understand, Sir Alan.

Two pics and you'll understand:

My rigs in an existing closet [18.5 Th/s; over clocked just a wee little bit]:





The new mining closet I'm building still needs a bit more work (caulking, priming, painting, finish electrical, add an exhaust fan, add an exhaust duct with damper to the outside through the window in the closet, weather stripping around all of the doors, etc.  As for the size of this thing: it's big enough to easily hold 96 S4's.  It has two 36 inch doors on each side to have easy access to the front of the rigs.  Each door will have four (4) 25"(w) x 14"(h) grilles to allow a 12,000 CFM to 18,410 CFM exhaust fan to easily pull air into the rigs intake, through the outtake fans into the closet and out of the exhaust fan to the back yard.  One of the doors has four (4) grilles already.  I'm installing the grilles only as needed.  I only need one door with grilles at the moment.  More grilles will be added as rigs are added.  The center door in the front is for access to the switch, router, PDU's, fan, the rear of the rigs, etc.




25.5 Th/s will be added to this in March for a total of 44 Th/s.  The goal is 200 Th/s by the end of 2015!

These guys are doing something similar to what I'm doing but in a POD.  They are pulling the air in through filtered grilles with three (3) 6500 CFM fans to cool the rigs but more high dollar elaborate:

http://www.cryptokube.com/

Youtube video of what they are doing:

https://www.youtube.com/watch?v=5bDtgIcVb3s

I have a window in the back center of this new closet.  It is 32"(w) x 36"(h).  This new closet is 8'(w) x 8'(d) x 7'(h) = 448 Cubic Feet.  I'm presently eye-balling a 30 inch single phase 120/240 Volt 12,000 Cubic Feet per Minute (CFM) exhaust fan:

http://www.h-mac.com/tpi-mcd30-112.html

I'm also eye-balling two different 30 inch single phase 240 Volt 18,410 CFM exhaust fans:

http://www.industrialfansdirect.com/IND-FA-EF-RS/LFI-HVAR30CBD30500M.html

http://www.industrialfansdirect.com/IND-FA-EF-CM-II/LFI-HVA30SLB10500.html