Well, if the spec sheet I read is correct, 29.7 dB is moderately quiet, comparative to a whisper a few feet away. The 10-20 dB range is often referenced as the sound of wind through trees or leaves, 30 is a whisper, 60-70 is equal to having a conversation with someone.
There are quieter options such as corsair quiet series, but they provide far less CFM comparatively.