GlossaryEN1 min readUpdated: Jun 16, 2026
Sea freight container ventilation
When a loaded ocean container crosses climate zones – say, from a tropical port into cooler open-sea air – the inner walls chill and moisture held in the air condenses on cargo and surfaces, a phenomenon known as container rain or container sweat.
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Source: https://www.hapag-lloyd.com/en/products/container-ventilation.html
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When a loaded ocean container crosses climate zones – say, from a tropical port into cooler open-sea air – the inner walls chill and moisture held in the air condenses on cargo and surfaces, a phenomenon known as container rain or container sweat. Sea freight container ventilation addresses this through passive air exchange via standardised venting openings in the container frame, through ventilated containers fitted with dedicated side apertures, or through active on-board drying systems. Desiccant bags are widely used alongside ventilation measures to absorb residual moisture from the container atmosphere. Moisture damage ranks among the most frequent causes of cargo loss in ocean shipping, making a container's ventilation suitability a key criterion for shippers, freight forwarders, and cargo underwriters when planning stuffing and stowage.
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