1,36 In. Portable Air Cooler, 2,Cools 2,500 sq. ft,/ 3,high performance, 4, Variable Speed 5, Durable ,energy ... protection, evaporated with water without harmful refrigerants5. Fresh air 0-12,000 CFM, cools 2,500 sq ft ... Almost maintenance-free operation and longer life. Evaporative cooling Air Delivery(CFM) 0-12,000Fan Motor(hp) 1/ ... density and others where need ventilation. Evaporative air cooler