After living with the miner in the same room as me. It drove me and my wife crazy. It was really noisy. So this morning I have changed the cheap 120mm case fan which come with the miner. And put in 2 Arctic F12 PWM 4 pin fans. Now the miner is so quiet you can not really hear anything.
The original fan was making sonic noise, like an old plane. I highly recommend everyone to do this. The Arctic F12 is actually the same fans they use in the KNC miner Jupiter. I know because I have 2 of these bad boys.
If it is good enough for a 670 GH/s miner, it should be good for this 220 GH/s miner.

They are noisy, but you will have to let us know how they get on. I have mine in the garage because they are that noisy plus it is cold in there.