Product review (4 stars): Attention: The vent is 7''.
This looks pretty cool. However, the vent is a 7'' hole, which is very rare in use. I may should go to home depot to buy a reducer, but no such a reducer is sold there. So I bought the 6'' duct and some "red tape" to seal the edge. Another thing should we pay attention is that this fan is dual use, which support duct or ductless. So if you didn't seal the vent exit which blow back to your kitchen, you'll have your hair blown even though you've put the duct on.