Finned Tube Air Cooler for Industrial Gas Cooling This air cooler uses ambient air as the cooling medium. Hot process gas, compressed air or flue gas passes through the finned tube bundle and gives up heat to the air flowing across the fins, so the duty is handled without cooling water or where water cooling is not allowed. It suits process gas cooling, kiln and boiler flue gas cooling, post dryer gas cooling, cooling sections in ventilation systems and chemical reaction gas