http://www.quietpc.com/cl-swif2-12p
They are rated at 75cpm, but I plan on using two. These fans are very quiet and I have used them to tone down a Norco server. They will be going in a spare bedroom, that is used occasionally . So I want to keed the noise to a minimum.
The cube is consistent and is like a quiet desktop pc. You could have 50 in your room and not really care. The Antminers are the same, IF you can keep it on its low rpm setting. As I have a single blade the aerodynamics aren't as good and so I use 2x120mm fans blowing directly on the heatsink to keep it cool and quiet.
Neither my antminer or cube is audible over my Avalon running at min rpm though.
I bought a couple S1s used and idk if they've replaced the fans but they only run on max RPM. What connectors are they supposed to be plugged into to allow for a variable speed?
I have them in a cold room and the reported temp is 25C