Ducted hoods, also known as vented hoods, require ductwork to draw the pollutants out of the home.
Ductless hoods, also known as recirculating or un-vented hoods rely on charcoal filters that attract and capture odors before the air is expelled back into the kitchen. Ductless hoods will not eliminate the heatand humidity from the air, but rather filter grease and odor from the air.