ISO 14520-6:2005 gives specific requirements for gaseous fire-extinguishing systems, with respect to the HCFC Blend A 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 with nitrogen propellant. This does not preclude the use of other systems. This title may contain less than 24 pages of technical content.
You can specify the type of files you want, for your device.ISO 14520-6:2006, Gaseous fire-extinguishing systems - Physical properties and system design - Part 6: HCFC Blend A extinguishant | ISO/TC 21/SC 8. I was recommended this book by a dear friend of mine.