This fan shorted out for no reason and it is one month past installation and too late to return.  Turns out that it worked when tested and then the 3rd time tried it blew out something in its little black box.  My electrician that installed it found a faulty wire that does not work.  If you buy this turn it on for a long time to see if it blows right away  - had I done this I could have returned it right away - bought two so I am crossing my fingers on the other one!