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Gaseous fire-extinguishing systems. Physical properties and system design - HFC 236fa extinguishant Ingestion-build-159183 BS EN 61508-3 shares best-practice1 Scope This part of ISO 14520 gives specific requirements for gaseous fire extinguishing systems, with respect to the HFC 236fa extinguishant. It includes details of physical properties, specification, usage and safety aspects and is applicable to systems operating at nominal pressures of 25 bar and 42 bar superpressurized with nitrogen. This does not preclude the use of other systems.