These Medical Deep Freezers adapt CFC-free refrigerant. E-series: Independent inner door design minimizes the loss of cold air when opening the door; W-series: The cabinet with large drawers design, which is convenient for users to access items. There are all widely used in hospitals and laboratories. This is for placing and preserving storage such as drugs, vaccines, blood, enzymes, hormones, stem cells, extracted RNA and gene libraries, and important biological and chemical reagents.