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In page Draught beer:

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Cask beer should be stored and served at a cellar temperature of 12 °C (54 °F). Once a cask is opened, it should be consumed within three days. Keg beer is given additional cooling just prior to being served either by flash coolers or a remote cooler in the cellar. This chills the beer to temperatures between 3 and 8 °C (37 and 46 °F).[citation needed]