Celsius^® FFTp freezer is a horizontal plate freezer allowing controlled and adjustable freezing of biological products filled into Celsius^® FFTp with Safecore™ Technology containers. In plate freezers, the liquid repartition inside each container is controlled and the freezing conditions are the same for each container inside the freezer. In collaboration with HOF, two standard freeze-thaw units have been defined for the processing of Celsius^® FFTp containers to offer a reliable process control during freezing/thawing but also matching production volumes and footprint restrictions.