Picked up a bath fan that was quieter. The existing fan is rated at 3.5 sones which is fairly loud but also some vibration transmits through the ceiling and framing making it much more objectionable, at least to me. We picked up a 0.8 sone fan and my wife said it was too quiet, that the louder fan would cover the noises of people using the bathroom. I guess I can understand that. But for best impression, resale, etc I had thought a quiet fan was better. After hearing the new fan in a quiet room (the store had them so they could be turned on but there was so much noise I could only hear the loud ones) I am starting to agree it sounds too quiet - it's hard to even tell it's on although it does move a good amount of air. I am now thinking something in the middle would be best. Something loud enough to give a low but noticeable, reassuring sound so you can tell it is on. But well balanced so it doesn't vibrate. What do others think?