The high-volume, low-speed (HVLS) Industrial Ceiling Fans from Cool Boss are constructed of aluminum alloy and powder-coated for ease of cleaning and a long life, each of the available models use smaller and lighter direct-drive permanent magnet synchronous motors. The fans come in two series, each with two models. The CB-11HVLS is 11.5’ in diameter and offers a maximum of 90 RPM, while the CB-16HVLS is 16.5’ in diameter and offers 78 RPM. The second series features the CB-20HVLS at 20’ in diameter and offers a max of 60 RPM, and the CB-24HVLS is 24’ in diameter and has a maximum of 55 RPM.