Kitchen Fume Exhaust Systems recirculates the air back into the kitchen instead of outside, which is why they are sometimes referred to as recirculating range hood. In a ductless system, a powerful motorized fan sits above the stovetop. When the switch is flipped, the fan sucks the air up through a vent and filter. Blowtech Engineers’ Kitchen Fume Extraction/ Ventilation System is functionally designed to remove smoke, odours, grease and other contaminants that are released into the air while cooking. Kitchen Fume Exhaust Systems removes fumes, airborne grease, combustion products, smoke, heat, and steam from the air by evacuation of the air and filtration.