KitchenAid Downdraft Duct-Free Kit - W10768190This ductless downdraft vent kit can be used when venting to the outside is either not possible or not desirable in your kitchen. The kit contains a filter housing that attaches to the blower under the ventilation unit the filter cleans the air before it re enters the home, removing unwanted smoke, steam and odours. This is an accessory that can be used with several brands; please check to see if your cooktop or range model number is compatible.