A cupola furnace is used by iron foundries for melting scrap iron and steel. Cupolas range widely in size and are usually made from a steel outer shell with a refractory brick lining. They are divided into two types; simple cupolas and hot blast cupolas. In both cases combustion air is blown into the lower part of the cupola via openings called tuyeres. To gain efficiency, the combustion air can be preheated using a heat exchange – a hot blast cupola. Usually hot blast cupolas will be of large capacity. The furnace is charged initially with coke and once alight iron/steel scrap, more coke and fluxing materials such as Limestone are added. As melting occurs molten iron drips into the well at the base of the furnace. As the well of molten iron increases in depth it can be periodically tapped off into a ladle for transport into the foundry for making castings. At the top of the cupola the hot dirty gases plus grit and dust are drawn off into the air pollution control system. This is a difficult application and the APC system will need over temperature protection, spark elimination and be generally of rugged construction. The AAF FabriPulse XLC with its off line cleaning facility is an ideal choice for this arduous application