Product review (5 stars): After that was adjusted the unit is now super quiet - even on its highest setting
We recently purchased this for our kitchen.  At first we thought we had an issue with how loud it was but then our contractor realized that their was a blockage in the duct causing the flap not to open properly (a possible reason listed in the trouble shooting section of the manual).  After that was adjusted the unit is now super quiet - even on its highest setting!  And it really sucks up the kitchen fumes.  Finally, it looks great.  Very happy with our purchase.