... PERFORMANCE; 3)Cools 4,000 sq. ft; 4)Portable evaporative air cooler; Variable Speed 1. Durable one-piece molded ... variable speed motor.3. No need to install, portable, could be used immediately after connecting water and ... protection, evaporated with water without harmful refrigerants5. Fresh air 0-20,000 CFM, cools 4,000 sq ... density and others where need ventilation. Portable evaporative air coolers