Heat exchanging elements
We can not imagine modern furnaces without good heat exchanging elements. They save up to 40% of energy, which is used for preheating of the fresh air that comes to the furnace. In addition to energy saving, honeycomb shaped filters and porous ceramic balls are also good removers (filters) of the dirt, which is a result of energy source combustion in the furnace. Both filters and ceramic balls can be cleaned with water and this way their life time is longer.