... GYS-15 2. Main features 1 Environmental protection product, with water as refrigerants, excluding freon, without any pollution ... Set ventilation, take a breath,cooling, dustproof, except taste at a suit, increase air oxygen levels and improve work efficiency ... realize post cooling air supply. 4 Aluminium alloy (aluminous model) framework profiles, beautiful appearance, 30-50 thick with double panel, ...