Big Fogg offers the 48″ Schaefer Mobile Box Fan – 20,679 CFM, 1 HP, 115 Volt which is the largest, most powerful and portable. It’s sized at 48″, 20,679 CFM high and 13,666 low from an ultra-quiet 1 HP, 2 ½ speed belt-driven and has a six-wing blade. Heavy-duty galvanized construction comes fully assembled. Grip handle, generous cord with storage wrap. OSHA guard allows for easy access for maintenance. Truck ship. Made in U.S.A. Factory shipped.