This part of ISO 14520 specifies requirements and gives recommendations for the design, installation, testing, maintenance and safety of gaseous fire fighting systems in buildings, plant or other structures, and the characteristics of the various extinguishing and types of fire for which they are a suitable extinguishing medium.

It covers total flooding systems primarily related to buildings, plant and other specific applications, utilizing electrically non-conducting gaseous fire extinguishing that do not leave a residue after discharge and for which there are sufficient data currently available to enable validation of performance and safety characteristics by an appropriate independent authority. This part of ISO 14520 is not applicable to explosion suppression.

This part of ISO 14520 is not intended to indicate approval of the extinguishing listed therein by the appropriate authorities, as other extinguishing may be equally acceptable. CO₂ is not included as it is covered by other International Standards.

This part of ISO 14520 is applicable to the extinguishing listed in Table 1. It is essential that it be used in conjunction with the separate parts of ISO 14520 for specific extinguishing,