Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
F28F21/00—Constructions of heat-exchange apparatus characterised by the selection of particular materials
F28F21/04—Constructions of heat-exchange apparatus characterised by the selection of particular materials of ceramic; of concrete; of natural stone
F28F21/045—Constructions of heat-exchange apparatus characterised by the selection of particular materials of ceramic; of concrete; of natural stone for domestic or space-heating systems