Abstract: A heat transfer enclosure for receiving articles to be processed or stored under conditions of reduced temperature, comprising one or more members of thermally conductive material having a thermal conductivity of at least 10 Wm?1 K?1, the one or more members having a contact surface for contacting articles located in the enclosure and including projections extending generally away from the surface; wherein in use heat is conducted between an article contacting the contact surface with an upper surface of the article and a heat exchange fluid in the heat transfer enclosure via an article—contact surface—projections—heat exchange fluid heat transfer path.