... ) HIGH PERFORMANCE; 3)Cools 4,000 sq. ft; 4)Portable evaporative air cooler; Variable Speed 1. Durable one-piece molded polyethylene housing.2 ... ft) 4,000Water reservoir (Gal) 50Weight(lbs) 360Application areas:1)Industry: injection molding, printing, shoe-making, food processing, rubber, clothing, ... polluted gas, population density and others where need ventilation. Portable evaporative air coolers