... 3.high effciency 4.environmental friendly 5.ISO9001 Closed Counter-current cooling tower1. Material: carbon steel, we also can produce stainless ... work, casting, forging, quenching liquid (oil), hydraulic oils, vacuum furnaces, central air conditioning, ground-source heat pumps, air compressors, injection molding ... , we sell our products all over the world. Closed Counter-current cooling tower