It is known that the jobs performed by firefighters are very risky. It has become known throughout the world that a large percentage of firemen who died were caused by some type of flame shock. In order to reduce the suffering of firefighters, ideas were developed for simulating fires and flaming shocks and observing and suppressing them in safe conditions so that firefighters could apply what they learned to interventions in real fires. In Sweden, steel shipping containers began to be used for simulations. It was seen that significant results were achieved in them, and this form of training began to be improved and implemented more and more. The protective measures that must be implemented are highlighted and the best forms of simulators are selected. Specialized companies that conduct such trainings have also developed. There are also data on the casualties of firefighters in these simulators, but further research revealed that no protective measures were implemented in these simulators and safe conditions were not ensured. These types of trainings, with the help of firefighters from Sweden, started to be conducted in neighboring Slovenia as well. Firefighters who have undergone this type of training claim that they now feel safer during interventions and that they are more confident in themselves. In cases of extreme forms of fire behavior, which include flame bursts, a firefighter without experience with flame bursts is in a very difficult situation. There is a high possibility of death, injury or unsuccessful performance of the intervention itself. The purpose of the flame shock simulator is not to "produce" flashovers and torture firefighters in conditions of high temperatures, but to get to know the enemy and understand the behavior of fires in space. The firefighter in the simulator can meet the fire enemy in a safe way, in the conditions closest to possible intervention, with the protective equipment he uses, with the colleagues he works with, with the nozzle he uses.