1,24 In. Portable Air Cooler, 2,high performance, 3,Cools 1, ... ft,/ 4, Variable Speed 5, Durable ,energy saving. 1)24 In. Variable Speed; 2)HIGH PERFORMANCE; 3)Cools 1,800 sq ... 1/3 h.p. variable speed motor.3. No need to install, portable, could be used immediately after connecting water ... Others:Somewhere there are polluted gas, population density and others where need ventilation. 24 In Swamp cooler