They've also stated (I think it was a different model) that they deem it acceptable in normal/average (i.e. noisy) office environments with aircon etc. Therefor

They've also stated (I think it was a different model) that they deem it acceptable in normal/average (i.e. noisy) office environments with aircon etc. Therefore if you can hear it, the problem is that your environment isn't noisy enough to drown it out !