What is the difference between a ducted range hood and a ductless or duct free one?
As the name implies a ducted range hood ventilates the air in the cooking area outside through ductwork. A ductless or duct free range hood filters the air through a charcoal odor filter and recirculates the air back into the cooking area. A ducted range hood will be more effective and efficient at ventilating the cooking area, but in situations where ductwork is not an option a ductless range hood is a good alternative.