Futuro Carbon Filter - Type A (2-Pack) | AC-CARB-AAll Futuro Futuro range hoods can be installed in either ducted (exhausted to the outside) or ductless (recirculating) mode. Although the ducted application is always recommended, it is sometimes impossible to install a duct for example, in high rise buildings, many condominiums, and co op apartments. In such situations, the range hood and a carbon filter can still be used, absorbing cooking odors and returning the cleaned air to the kitchen. All