... environmental protection, evaporated with water without harmful refrigerants5. Fresh air 0-10,100 CFM, cools 2,650 sq ft.6. Almost maintenance ... -free operation and longer life. Air Delivery(CFM) 0-10,100Fan Motor(hp) 1/2Voltage/ Frequency(V/Hz ... are polluted gas, population density and others where need ventilation. Air coolers