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Refrigerator using the French original "Taikang" closed compressor. The design of a unit or two element low temperature loop system for freezing system. High and low temperature heat test box with multiple wing type blower strength send wind circulation, to avoid any dead end, uneven distribution of the temperature and relative humidity inside the test area. The way out of the wind return cycle design, wind pressure, wind speed meets the test standard, and can make the door instantaneous temperature and humidity stabilization time. Heating, cooling and humidification system can improve efficiency, reduce testing cost, increase life and reduce failure rate.