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Freshly roasted coffee beans can also be stored in airtight silos for up to a month, if they are not packaged right after roasting. The silos are purged with Nitrogen gas to reduce the oxygen content to 3% or less, as they are initially filled with the beans. The Nitrogen generator then maintains a continuous blanket of Nitrogen gas on the supply of beans, to keep them fresh as the stored product is drawn down later for packaging.