In cases of melt preparation for larger tonnage production, the most common melting used in cast iron foundries is the cupola furnace. The main advantages of cupola furnaces compared to electric ones are: less sensitive to low quality charge materials and contaminants, oxidation and reduction reactions take place within and above the melt zone during cupola melting, which allows the use of highly oxidized and low quality scrap material, lower prices of alloys and non-metallic additions. The metallurgical process in the cupola furnace can be intensified by preheating the air that is blown into the working space of the furnace through nozzles. In addition to increasing aggregate productivity, reduced coke consumption and higher melt temperatures are also achieved. For the cupola furnace with a capacity of 3 t/h, the technological and constructional calculation of the recuperator sections was carried out. The calculation is based on the experimental data of furnaces and recuperators that are used in practice. In order to reach the temperature of the hot air blast up to 600°C and to use the energy associated with CO emission in the waste gases, the recovery waste gas system consisting of three recuperator sections was adopted. In the first, theoretical part, there is a description of cupola furnaces, a description and division of recuperators and their structural differences, and adescription of energy transfer in the recuperator. In the second part of the thesis, the technological and construction calculation of the recuperator sections was carried out.