1)Centrifugal Air Supply; 2) Three Speed; 3)Cools 600 sq. ft; 4)Portable evaporative cooling fan Desert coolers; 1)Centrifugal Air Supply; 2) Three Speed; 3)Cools 600 sq. ft; 4)Portable evaporative cooling fan Desert coolers;Three Speed 1. Durable one-piece moldedpolyethylene housing.2. Centrifugal air delivery system.3. No need to install, portable, could be used immediately after connecting ...