D-series Air-cooler is one kind of storage cooling equipment used in freon refrigerating, according to applicable temperature, there are 3 series including DL, DD and DJ,which can be used at different storage temperatures. DL type air-cooler is mainly applicable to about 0°C fresh-preserved storages; DD type air-cooler is mainly applicable about -18°C cold storages; DJ type cooling fan is mainly applicable to quick-freezing storages below -25°C.
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