I had this hood for over 30 days UNINSTALLED because I had to get somebody to come and install it, so I had to wait.  I just got it professionally installed today, and I AM ABSOLUTELY SICK.  This unit is so LOUD.  I WANT IT GONE.  There is nothing on the inside that is loose, as per the troubleshooting page.  This unit is supposed to be 45 to 65 decibels (or 1 to 1.5 sones) which was largely the reason I bought this - for the quietness of it.  Ughhhh!!!!!  Now it is too late to send it back.  NOBODY will want this even if I gave it away for FREE.  You wanted to know???  There, that is what I think Wayfair.  :(