The 5000SD features stainless-steel construction and an electrostatic ally-applied, polyester powder-coated interior and exterior finish for rust and corrosion resistance. The cooler's high-performance water pump provides uniform water delivery to the evaporative media. The unit cools up to 1,800 sq. ft. and is recommended for residential and commercial use in arid climates. This evaporative cooler performs best in dry, arid climates. Color: Cool Sand.