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U ovom radu dan je opis spomenute 3D metode, te ma-terije koja je potrebna da bi se moglo razumjeti na koji način se koristi navedena metoda u gašenju požara zatvo-renog prostora i to posebno s osvrtom na tehnike koje se zasnivaju na hlađenju požarnih plinova. Navedena meto-da poznata je još i pod nazivima: hlađenje plinova, ofen-zivna metoda ili obuzdavanje plinske faze u strukturnim požarima. Ukratko je izveden opis vatrogasnih mlaznica koji daje jasniju predodžbu o taktici gašenja 3D metodom. U ko-načnici, opisane su prednosti metode gašenja požara vo-denom maglom u odnosu na tradicionalne metode. Ključne riječi: gašenje požara, 3D tehnika gašenja poža-ra, vatrogasne mlaznice, hlađenje požarnih plinova It was common in the past for firefighters to focus their initial attack and strategy towards the visible flame, while the hidden dangers of flame exposure were ignored in the gaseous states. It is a fundamental error that has repeatedly taken the lives of firefighters. The lives of firefighters are par-ticularly threatened in enclosed spaces due to uncombusted pyrolysis products. (when solid combustible materials, such as wood and plastic, decompose into flammable gaseous sta-te during pyrolysis.) A new approach to putting out fires in enclosed spaces not only consists of extinguishing fires, but begins with an un-derstanding of how fires develop; the conditions under which fires develop indoors; the ventilation conditions, and most important, the cooling of the smoke layer and the applica-tion of water mist in enclosed spaces. This paper provides a description of the aforementioned 3D methods and materi-3D metoda gašenja požara i utjecaj vatrogasne mlaznice na termodinamički efekt 3D method of firefighting and fire jet’s impact on the thermodynamic effec