Research film about the work of the heating and rolling furnace (the furnace of the rolling shop of the "Serp and Molot" plant in Moscow). The survey was carried out in the research laboratory of the State Institute for the Design of Metallurgical Plants (Gipromez). 1st part. Animation illustrating the operation of the heating and rolling furnace. 2nd part. Demonstration of the movement of gases in a heating-rolling furnace on a model, where instead of moving gases and air heated to high temperatures in the furnace, tinted water is used. 3rd part. Demonstration of the movement of gases in a heating and rolling furnace on a model. Animation illustrating the movement of gases in a furnace.