Based on the developed methodology, comparative calculations of the distribution of temperatures and heat fluxes along the length of the shaft, equipped with various types of cooling devices of a special design, were applied to the furnace fan type C9-55 No. 10, widely used in convection furnaces for heating workpieces for stamping. The calculations show that the average temperature of the impeller hub is 50 - 60 ° C lower than the temperature of the gas in the furnace (500 - 700 ° C), which is due to the balance between the heat input to its surface due to blowing by heating gas and its removal by thermal conductivity in side of the low-temperature part of the shaft. The most intensive reduction in the temperature of the shaft from 500 - 650 °C to 100 - 180 °C takes place between the impeller and the first bearing (near the outer wall of the furnace). From the first bearing to the clutch, the shaft temperature decreases monotonically to an ambient temperature of 25 °C. The calculations also established that, with a gas temperature in the furnace of 500, 600 or 700 °C and a shaft rotation speed of 400 rpm without the use of cooling devices of a special design, the first bearing is at a high temperature, respectively, 98; 115 and 133 °C, which is significantly higher than the permissible 75 - 95 °C. The dependence of the shaft temperature in the region of the first bearing on the frequency of its rotation with single-disk, rod and multi-disk cooling devices shows that the highest temperature is observed in the unequipped open area, (160 °C), and the smallest, in the case of using a multi- with a diameter of 260 mm (40 °C). Using, for example, a single-disk device type OD 260 allows to ensure a temperature mode of the bearing at 75 °C at a shaft speed of more than 1000 rpm. If the speed of the shaft is reduced less than 100 rpm, in this case, the first bearing overheats, which worsens the operating conditions of the entire fan, is observed. The use of cooling devices rod (ST 260) and multi-disk (MD 260) types provides a satisfactory temperature regime of the running gear in the investigated range of changes in the rotational speed of the shaft from 200 to 1200 rpm. The presented materials can be used in the development of high-temperature fans for heating and thermal furnaces.