Cannot answer your question unless you answer the following: What range or cooktop is the hood for? Is it gas or induction? How wide is it--30", 36", 48"? If it is gas, what are the btus. If you don't know that, then at least provide the model number of the range or cooktop so we can look it up. What is the size/diameter of your duct going from the hood to the outside?

Setting all those questions aside, you should look for a hood that has baffle filters. The shape of it should be like a canopy shape. It should be deep enough front-to-back to be able to exhaust the front burners. Many cheap hoods are only 20" front-to-back, which is not sufficiently deep.

Hey Shannon, the range hood would be for a gas cooktop and is 30". The duct is currently 6" running to the outside. I haven't picked out a particular range yet but was leaning towards Samsung or LG.

I have found that a 390 cfm hood works fine for my 30" ordinary gas range. In some areas, if you go above 400 cfm, you are required to get "make up air" and that can become expensive. The range itself will sometimes recommend the appropriate cfms.