The Max-Fan family has been designed to be the smallest, lightest and most energy efficient fan of it's kind. With the current cost of electricity the Max-Fan can save hundreds of dollars every year. Demand the very best, accept no imitations. The Max-Fan Saves Energy, it is extremely energy efficient and has a lower life time cost. The Max-Fan saves space due to its small, airtight housing. Easy installation, lightweight and lower transportation costs. Very high aerodynamic efficiency. Optimized mixed flow is quieter than other fans of the same size. Specifications: CFM - 667, RPM - 3250, Max Watts - 179, Max Amps - 1.5, Duct Diameter - 8-inch, Housing - Plastic, Blade Design - Mixed Flow.