Multi-Wing 8X Series fromCrowley Co.have a twisted broad paddle profile blade that produces high air volume and pressure at lower speeds, which results in lower blade tip noise and quiet operation. The fans are made with fiberglass-reinforced polypropylene blades and cast aluminum hubs. They are available with three, four or five blades and have an adjustable blade pitch. Any diameter between 36 and 69" is standard.
March 1, 2002