Abstract: An apparatus for depositing solid carbon dioxide on items to be refrigerated comprises a device (10) operable to convert a stream of liquid carbon dioxide into a forward flow of gaseous carbon dioxide containing entrained particles of solid carbon dioxide, a carriage (8) upon which said device (10) is mounted for translating in opposite directions and means for moving said device so as to direct said stream towards a plurality of individual items to be refrigerated.

Abstract: An insulated chamber (1) for preservation and transportation comprises a container (2) of carbon dioxide snow provided with a lateral opening (5) permitting the injection, within the container, of liquid CO.sub.2 under pressure by a distribution device (10) connected to a source of liquid CO.sub.2 (6). The distribution device is provided with an electrovalve (18) controlled by a control block (19) comprising a timer permitting selecting the duration of injection of liquid CO.sub.2 into the container (2) to form there a controlled volume of carbon dioxide snow. The installation is useful for the preservation and transportation of fresh food products as well as frozen food products.