Product review (2 stars): The main problem as we were using the circular vent ...
The main problem as we were using the circular vent to go through cabinet and out.  There  was no clearance. The pipe on top of range is set all the way to back.  We have solid wood cabinets which needed at least a 3/4" to 1" gap so when you pushed unit up and in it would not go all the way in.

Also, the unit is not high grade stainless as a magnet will stick to hood.