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Greenheck, (www.greenheck.com) America's leading manufacturer of ventilation equipment, designs, manufactures and ships fans and ventilators, centrifugal and vane axial units, make-up air units, energy recovery ventilators, dampers, louvers, kitchen ventilation systems, and laboratory exhaust systems around the world. The company has sales in excess of $400 million annually and is number one in air movement and control.