TANGRA COT/COX heat exchangers use fluid water or glycol to heat or cool clean air without aggressive mixtures. Units are provided with 2 plugs 1/8 for draining and installation of deaerators. TANGRA COT/COX heat exchangers represent corpus of galvanized metal sheet with incorporated heat exchanger "water-air" - constructed of copper pipes with aluminum lamellas. Good contact between pipes and lamellas is achieved with mechanical distension. Units are designed for direct installation on the air ducts ( in-line systems) and also for incorporation in ventilation  and air-conditioning equipment (air handling units). All sections are tested for tightness at 30bar and the maximum operating pressure is 10bar.