Large diameter, low speed Big Ass Fans efficiently recirculate heat, pushing it back down from hangar ceilings to reduce reheat time and provide significant energy savings. The patented airfoil system features winglets and AirFence technology. NitroSeal drive gearbox is hermetically sealed for life and nitrogen-filled for zero moisture, contamination and maintenance. Onboard VFD provides simple integration into building automation systems. Entire fan is UL 507/CSA certified, ensuring that your fan meets country safety requirements. For more information visit www.bigassfans.com or call (877) 244-3267.