... PERFORMANCE; 3)Cools 4,000 sq. ft; 4)Portable evaporative air cooler; Variable Speed 1. Durable one-piece molded polyethylene housing.2 ... . Efficient environmental protection, evaporated with water without harmful refrigerants5. Fresh air 0-20,000 CFM, cools 4,000 sq ft.6 ... . Almost maintenance-free operation and longer life. Air Delivery(CFM) 0-20,000Fan Motor(hp) 1Voltage/ Frequency(V ...