'Dew Point Rule'or 'Three Degree Rule'The Three Degree Rule states that a cargo hold should be ventilated when the dry bulb temperature of the outside air is at least 3°C lower than the temperature of the cargo.
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Insulating your shipping container can greatly reduce the amount of moisture in the air and prevent container rain. Container insulation can keep the contents of your cargo warmer than the dew point, preventing the extreme temperature differences that lead to condensation.