Butterfly Labs - Bitforce Single and Mini Rig Box

[John vera]

I'd recommend high rpm small fans blowing in the gaps between the singles, and low rpm blowing out the other side.

[Jamoden]

A few days ago I replaced the fan of my Rev. 3 unit with a 'Noiseblocker BlackSilent Pro Fan PE-P - 92mm'. Temperature now is stable at 58°C - 61°C. There is no throttling, average speed is at 820Mh/s. The solution is not perfect as you still can't sleep right next to it, but it is much better than before.