Both the OEM Coils and 6000 Series copper tube-fin heat exchangers offer high performance and reliability. The OEM Coils heat exchanger has aluminum fins and is unpainted with galvanized steel side plates. The 6000 Series heat exchanger has a different tube configuration, uses copper fins, is painted black for corrosion resistance, and includes a fan plate. OEM Coils are best suited for the price-sensitive customer in applications where the appearance of the heat exchanger is not critical, such as when the heat exchanger is hidden inside of the equipment. The 6000 Series is an attractive, high performance heat exchanger that delivers efficient heat transfer and maximum reliability in a compact package.