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These fridges are used for coffee machines where the machine dispenses the milk as well. They make sure that the machine always dispenses cold milk, instead of the milk (and its tube) being placed right next to the hot coffee machine exterior.

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Again, none of this explains why said fridge needs to be separate and dedicated to milk storage.

dedicated storage like this one [1] keeps the milk ready to use at all times, and minimizes the risk that someone in a hurry forgets to put the milk back to the fridge after making a coffee.

[1] - https://media.nisbets.com/asset/core/prodimage/largezoom/cy1...

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