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Deep freezers keep food frozen at or below 0 degrees Fahrenheit, or -18 degrees Celsius. The term “deep freezer” used to mean an appliance with colder temperatures and a faster freezing process than fridge freezers.There are three types of freezers on the market: upright, chest, and refrigerator-freezer combinations. The upright and refrigerator-freezer are available as manual-defrost or frost-free models. Though less convenient, manual-defrost freezers are more cost-efficient.With this technique, foods are quickly brought to a temperature between -30º C to -50º C until the product core reaches -18º C. This is a precise process used on fresh products and allows you to store safely, for a long period, nutritional characteristics of the food, especially fish and vegetables.