A 4-star freezer needs to be -18 degrees Celsius minimum but typically can operate down to -25° C. At these temperatures, most foods can be kept in the freezer for a long time. However, over time frozen foods may start to dry out, causing freezer burn or a loss in quality.
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†Source Euromonitor International Limited; Consumer Appliances 2019 ed, as per major appliances definition, retail volume sales in units, 2018 data