###### Abstract
In 2012, the DARPA Agency presented a video showing the impact that sound can have on the combustion process [49]. It should be noted that the DARPA Agency has developed two prototype fire extinguishers. The first is an electromagnetic fire extinguisher. This technique uses an electrode to extinguish flames from the combustion of methane and liquid fuels. The electrode was covered with a glass coating as an insulator, so a current does not flow between the electrode and the environment. Due to the vibration of the electromagnetic field particles and a series of violent streams, the ignition zone was separated from the fuel source and, consequently, the flames were extinguished. This method has some limitations in application for example, it is not suitable for extinguishing fires on the surface of liquids. The operation of this extinguisher is quite different from the environmentally friendly technology for extinguishing flames using low-frequency acoustic waves, which applies different mechanisms and laws of physics to extinguish flames. In the case of solids (such as a coal), although it was possible to suppress the flames with acoustic waves, they returned because, unlike many other flame extinguishing techniques, the heat from inside the material was not taken away. The transmission factors are different in open and closed spaces [50]. It is assumed that this technique may find application especially in the case of extinguishing firebreaks. Since oxygen concentration is one of the key factors affecting the course of a fire (according to the combustion triangle), it is presumed that the acoustic technique may find application primarily to extinguish flames inside facilities (in halls or industrial plants). In open space, because of the range of operation, this technique has a limited effect. However, tests conducted in Poland to extinguish flames outdoors have also been successful (up to a distance of a few meters). In addition, the acoustic technique can be applied successfully to control the combustion of materials. Another direction for the use of acoustic waves may be the elimination of pollutants from the air resulting from fires, among other things, while this requires further research. Undoubtedly, all measures to protect the environment serve human life and health, which is important in times of energy transformation [51; 52]. Because there is still a need to fill the literature gap in terms of understanding the extinguishing properties of acoustic waves (this applies mainly to low-frequency waves, which exhibit the best capabilities of fire extinguishers), this article consists of several parts on fire protection. First, the state of the art is presented second, the methodology is described (including the physical apparatus); third, the components of the laboratory station are shown; and finally, the original results of the experiments are presented. The data obtained are included in tabular form and diagrams. The potential benefits of this technology, its limitations, and directions for further research are also indicated. The article concludes with a brief summary that succinctly presents the most important conclusions.