Closed-type Cooling Towers, or closed-circuit cooling towers, are among the most preferred cooling towers. Today, while explaining the closed-circuit coil cooling tower, we are sharing a video we have prepared for you. The coils are very special productions both in terms of mechanical manufacturing and hot-dip galvanizing. The most important final touch of coil manufacturing, which requires detailed expertise from the type of metal used to its thickness and hardness level, is the coating method. While copper coils do not use any coating method, iron coils are coated using the hot-dip galvanizing method, providing high resistance to high water flow and high airflow erosion.