Four Air manufactures closed circuit cooling towers (also known as dry-wet coolers or fluid coolers) designed to deliver high-efficiency cooling without exposing the process fluid to outside air. This minimizes contamination, scaling, and system fouling — making it perfect for sensitive or closed-loop systems.

In these systems, heat is removed from process fluid via a heat exchange coil, over which water is sprayed and cooled by ambient airflow. The process fluid remains sealed within the coil, ensuring clean and efficient operation.