Blue Fin is an anti-corrosive epoxy coating applied to the aluminum fins of the heat exchanger to protect against water, salt, and acid. This specialized coating allows water to drain more quickly from the coils, which improves the defrost efficiency and overall heat exchange. This is a vital feature for our customers in coastal Florida or Texas, where salt spray can rapidly degrade standard units. You will find this protective technology on many of our one zone wall mount systems. It significantly extends the lifespan of your central condensers compared to untreated models. Protecting your equipment from the elements is the best way to ensure the longevity of your parts.