Ventilated containers are also known as passive (naturally) ventilated or coffee containers. Ventilation is provided by ventilation openings in the top and bottom side rails. The openings do not let in spray, to prevent depreciation of the cargo by rain or spray, for example. The common size for ventilated containers is 20'. Ventilated containers are used especially for cargoes which have to be ventilated in transit. Oneofthe most significant ofsuch commodities is green coffee beans, hencethe name coffee container.