At NuTone, we always recommend ducting to the outdoors, as it is the best option. There are certain circumstances, however, in which a non-duct recirculation hood is the proper alternate solution, due to an inability to duct to the outside. A recirculation hood provides grease and odor elimination while removing smoke from the cooking area. Additionally, it protects cabinets from heat and moisture, and provides quality essential task lighting. With many styles and models that offer adaptability to non-duct recirculation, NuTone has a solution for any residential need.