Product review (5 stars): Great vent for a 30 inch range
I bought this locally to set over my new commercial style 30 inch Kitchenaid range.  I needed extra power from my vent and this Vent-A-Hood was what my local store recommended.  It works beautifully.  It provides plenty of light over my cooking area and that two blower option is great - I only turn on what I needed.  It is so powerful that if I am not careful, it can suck my dry spices up and out instead of on my food (holding my hand a little lower solves this problem.)

The vent came with an 8 inch internal vent.  My house had 6 inch installed through the walls.  My contractor was able to use a vent reducer to make it work.  I was afraid that it might cause an issue with less air being removed but that is not the case - it works beautifully.  I recommend this brand for anyone who has a 30 inch space and wants a good vent that looks great, too.