DJ freezer ceiling cooler (also known as the cooler) is a cooling device used for cold storage, d-series air cooler with DL, DD, and DJ three types are suitable for different temperature of cold storage. DL-suitable for 0 ? Cuvin cold storage, such as holding of fresh eggs or vegetables, DD-apply Cuvin-18 ? storage, DJ frozen freezer compatible Cuvin-25 ? or below-25 c is mainly used for meat, fish, frozen foods, drugs, medicines, chemicals and other raw materials goods-frozen