What are the ventilation rules for cargo hold?

Rules on when to ventilate Dew-point rule Ventilate when the dew point of the outside air is lower than the dew point of the air in the hold. Three-degree rule Ventilate a hygroscopic cargo if the temperature of the outside air is at least 3°C below that of the cargo temperature (taken at loading).



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To test it, a thermometer on a thin rope should be lowered into the cargo hold through specially constructed temperature measuring pipes. These should have holes at regular intervals and reach almost to the bottom of the cargo hold.

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It has been found that the maximum temperature inside a shipping container can be up to 135 degrees Fahrenheit. At the same time, the lowest can be as low as -21 degrees Fahrenheit.

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