As the name suggests, and as is obvious to most people, under cabinet range hoods are meant for homes where you’ve got a cabinet installed directly above your cooktop. Quite a few people who opt for the under cabinet ventilation option are of the notion that these are mainly ductless hoods. That can’t be further from the truth.
Most of these models come with ducts, with the option to be ductless, but ducting is the norm. Depending on the setup of the model, you could have your ducting directly above the hood, through your cabinet or directly behind the unit exiting through an exterior wall. Make sure you check venting options and duct sizes before you buy.
Let me stop talking for a while and let you check out a comparison of the most sought after under cabinet range hoods followed by a list and a short description of all the models that I've thoroughly researched and reviewed. Below the list of products, you will find some more general information that could be of help.