The CD series products are air cooled heat exchangers for refrigeration system. They are divided in 4 groups: CD, DCD, DCS and CDV. The air flow of them is flowing out by side except CDV, which is top blowing. All the products have been tested on 2.8MPa air leakage, and the system is disposed of pollution, applicable to R22, R134a, R404A, R407C systems.