The rangehood you choose will depend on the amount of room you have in your kitchen, as well as where your cooktop is located. For example, an island cooktop will require a canopy or island rangehood. There are two main venting options, ducted and recirculating. Ducted rangehoods draw smoke and odours from your kitchen and vents them outside. When ducting is not a possible option, recirculating rangehoods draw fumes and send them through filters, this filtered air is then recirculated back into the room. Many rangehoods are capable of offering both options.