be movable in the example the service platform 7 comprises wheels which are located in the rails 14 in the floor the path of the service platform 7 is controlled by means of the rails 14 it is also possible to arrange the service platform 7 to be movable in another manner moving the service platform 7 and or the shielding wall 8 may application specifically take place either manually and or with engine power such as for example by electric motor usage the shielding wall 8 described above protects the person 1 on the service platform 7 it is also possible to arrange a shielding wall 10 in connection with the service platform 7 thus the shielding wall 10 moves along with the service platform 7 always being between the working area of the service platform and the smelt spouts 2 thus protecting the working area the shielding wall 10 of this service platform 7 can also be equipped with different hatches and windows for example as has been described above the size and appearance of the shielding wall 10 of the service platform may vary depending on the target of use the shielding effect of the shielding wall 8 as well as work safety can be improved by arranging the devices in the smelt spout area in advantageous positions by designing the primary air nozzles 5 for example smaller the working position is made safer and more ergonomic as can be seen in fig2 by arranging the first side of the air nozzle 5 the side opposite to the side connected to the furnace close to the vertical line formed by the shielding wall 8 the person 1 does not have to reach as much as in solutions of prior art.