ISO 14520-14:2005 gives specific requirements for gaseous fire-extinguishing systems, with respect to the IG-55 extinguishant. This title may contain less than 24 pages of technical content.
You can specify the type of files you want, for your device.ISO 14520-14:2005, Gaseous fire-extinguishing systems - Physical properties and system design - Part 14: IG-55 extinguishant | ISO/TC 21/SC 8. A good, fresh read, highly recommended.