Product review (2 stars): Warning:  Plug in and test  first before installing!!!
Rangehood looked nice when opened.  Installed only to find it making a humming noise and not operating.  I called the manufacturer and they told me that the 3 year warranty is void if I don't plug it in first and try it (did not see that in the fine print).  So the warranty is only good if you don't use it????  I did set up a return with Amazon who handled it very professionally and I had a new one to me in 2 days.  Unfortunately, the new one had a dent in the side.  I can't be bothered to go through this again so I'm keeping it.  The new one does seem to run fine and the dent is on the side/back so not to noticeable.  Overall,  very happy with Amazon.  Not happy with Z line customer service