The article considers the design of the heating chamber consisting of single sections equipped with the same type of block-type devices. Heating of the metal in the block is carried out by the jet blowing the surface of the balls with a heated gas flow circulating inside its body using a high-temperature fan. On the basis of the proposed method, a computational analysis of several thermal modes of operation of the heating chamber, consisting of five sequentially installed single sections, was carried out. The section consists of housing and a jet heating unit placed inside. The unit is a sheet steel structure, inside which, by means of a nozzle system and a high-temperature fan, a circulation circuit is organized, which is necessary for the movement of the heat carrier. The heat carrier is heated by a burner. The balls are stacked in one row and move inside the furnace body by means of a conveyor. The effect of changing the performance of the circulation fan on the parameters of the furnace has been studied. An analysis of the obtained calculated data showed that with a constant furnace performance, the heating mode of the balls is determined by the ratio of the coolant temperatures and the fan performance. Doubling the performance of a fan of a single section from 14,000 m3/h to 28,000 m3/h leads to a decrease in the required coolant temperature by 30% from 572 °C to 434 °C, while the efficiency of the heating chamber remains unchanged equal to 0.71. An increase in performance of a fan leads to a decrease in the temperature of the pumped gas, which contributes to an increase in the reliability of its operation by maintaining the normal thermal regime of the running gear. The materials presented in the article can be useful in the development and design of convective furnaces.