Product review (3 stars): Poor service for a high end manufacturer
The hood lacked the adaptor for a rectangular output, which was shown in the diagram and should have been in the box. Kobe customer service refused to overnight the missing part without proof of purchase, which my contractor didn't have, because he wasn't able to reach me at work. Installation was scheduled for they next day so they had to jerry-rig it from the round opening. Kobe shipped the part the next day, by GROUND, and it arrived a week later. The folks who answered the phone were disbelieving that the part was missing. It's like dealing with the DMV!

Moral of story: count your parts right away, no matter what.

That said, the hood is relatively quiet at the Q setting, but gets loud on the H setting. I believe some of this is due to turbulence in the ducting because of the changing cross-sections of the pipes. While some was unavoidable, the lack of the rectangular part really did not help.