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How to Ventilate an Island Vent Hood Suspended from the ceiling, an island vent hood helps circulate air and keeps your kitchen devoid of smoke and odors. It's also a stylish function that improves your cooking area. Ventilation types include external venting, which pushes air through ductwork to the beyond your home, and recirculating models that filter and recycle cooking fumes. Some hoods can even be converted between one and the other. Ventilation Unlike wall-mounted range hoods that vent air vertically