Collider I see that, just discovered this whole new world of quiet cabinets for servers so rapidly checking each out. I think that one has its own built in cooling system (not just fans), there are appear to be quite a few makers of these cabinets different sizes, different heat tolerances etc. For those seems it is based on the fan they are using to extract the heat from the cabinet which course can always be swapped. Main thing based on all the demo videos they are all quite effective.
This one is small maybe good for 1 unit for the home, cheap enough at 650 dollars to get a good nights sleep and still keep on hashing.
http://www.xrackpro.com/XRackPro2-4U-Noise-Reduction-Enclosure-Cabinet-p/xr-nre2-4u-us.htmHaven't looked yet buy I'd bet there are DYI plants out there to do this. Just a box with sound proofing materials and some fans.