EnergyLogic’s Airvolution 550 is perfect for medium to large shop spaces. The fan is extremely effective at controlling temperature and humidity. The system design eliminates the gearbox for a lighter, leak-proof fan that is durable and runs with less friction. This design makes it easy to install, maintenance-free and practically inaudible. The fan’s size ranges from eight to 18 ft. and is available in a variety of colors.