A hood with a filter will trap a lot of the smoke particles and oil...just venting it outside without something to gather it first will be less effective. Moving a lot of air is noisey. Many smaller units have a low cfm - you need lots. This also means you need makeup air. Since you are exhausting lots of conditioned air and pulling in unconditioned, it is not very efficient, but that is the tradeoff of not getting grease and smoke all over the house along with the lingering smells. Some of the better ones can get quite costly. I haven't looked for awhile, so I can't make a valid suggestion. Mine specifies an 8" duct! and can move over 800cfm on high, it cost me about $1k.