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Maximize ventilation while minimizing power usage with gravity exhaust and supply ventilators. Working on the air pressure differential between the inside and outside of a building, warehouse, factory or other commercial site, these ingenious ventilation systems require next to no maintenance and less upkeep than other types of powered exhaust vents. Choose from standard gravity vents, exhaust and supply gravity vents, gravity roof vents and more. Looking for other types of ventilators? Zoro has a wide selection of belt drive exhaust vents, roof ventilators and direct drive exhaust ventilators.