Product review (5 stars): I purchased the 30" and placed it on the wall and very pleased that I wouldn't have to redo the above counter ...
Replaced a 1940s walk fan with this hood.  I was concerned about the air draw since I have a 36" stove and it sits 8" away form the wall diagonally.  I purchased the 30" and placed it on the wall and very pleased that  I wouldn't have to redo the above counter cabinets.  the distance the hood is away from the front burners still produces an excellent draw..  Easy to install..I put the unit on the existing dinner wall switch and it is nice to be able to dim the overhead lights on the hood.