While this is more or less standard, the lowest you can go and that is available in the market is about -18 degrees centigrade and that should be your mark.
Deep freezers should be heavy duty. The average best-bought freezer would have at the very least 100 litres of storage capacity (for a mini Storage Freezer that is good for home storage). But if your use case is for a retail space, then you would go with a much larger capacity such as a 250 litre or even a 500 litres capacity fridge. Again, this would be totally dependent on your use and there is no point in buying a large freezer you will not be using.
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