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Also, the shorter it is in depth, the more cfm it needs to pull from the front burners, or possibly from stuff leaking around the open oven (say if you were broiling and had the door partly opened). this also means you may need make-up air in the house! But, having an actual vent that works and vents the smoke/smells/vapors, etc. outside is really nice.
That is part of the reason, I'm kind of leaning towards adding a small flush mounth through the wall unit up on the side wall. The ceiling above the range will be have a beam splitting it from the rest of the kitchen, so having a vent higher up, would get any smoke/smells/etc. out of that space...