The urgent task of designing new and reconstructing existing gas heating furnaces is to achieve high uniformity of heating, which is estimated by the value of the permissible temperature difference on the surface and in the cross-section of the heated blanks at the time of issuance from the furnace. The greatest difficulties in solving this problem take place for chamber furnaces, the combustion of fuel in which contributes to the formation of an uneven temperature distribution in the gas volume of the chamber and, as a result, to the unevenness of heat flows on the surface of the heated workpiece.