Downdraft Ventilation
When should I use a downdraft vent?
Pop-Up Extraction Velocity
Downdraft units (e.g., Best/Cattura) are used in islands where an overhead hood isn't desired. They require a deep 27" cabinet carcass to house the pop-up mechanism and a 6" or 10" duct discharge through the floor.
Motorized exhaust systems that retract into the cabinetry; requires 12" of internal base cabinet depth for the blower housing.