Whatever the shape and size of the warehouse or silos, the cold air is blown into the lower part of the storage sites, cooling the lower layer of the ensiled product at the beginning. As the refrigeration progresses over time, the cooled product zone increases, progressing upwards until the product is completely refrigerated. In order to guarantee an optimal refrigeration process, it is essential to install a ducting system that allows a correct and uniform distribution of the air, while in the upper part of the warehouse / silos a suitable exhaust air outlet must be provided for.