The Argonite fixed fire extinguishing system (FFES), utilises the mixture of nitrogen (50%) and argon (50%). Both the nitrogen and argon are natural neutral gases, which are found in the Earth’s air at concentrations of 78% and 1%, respectively. Such a mixture has no deteriorating effect on the ozonosphere, as it is the case with (H)CFC, nor does it contribute to the greenhouse effect, as CO2. The ARGONITE is completely safe for the environment, electronic devices and men. Availability of this extinguishing agent in the Polish market causes that neither the charging process, nor a given charge itself is required to be certified (as it is with the other gas-based systems). It is of key significance in subsequent maintenance and servicing of a system (a low cost of and ease of re-charging cylinders).