1.evaporative air units 2.Environmental friendly 3.energy-saving(80%) 4.efficient 5.less maintenance ... GYS-25 GYS-20 GYS-15 2. Main features 1 Environmental protection product, with water as refrigerants, excluding freon, without any ... pollution of atmosphere,really achieve environmental protection. 2 Set ventilation, take a breath,cooling, dustproof, except ...