This site is geared more towards computers, programming and such. I did some info on your question but it may vary based on state codes.
FM-200 cylinders may be placed in or out of the protected space, depending on the needs of the client. Both NFPA 2001, Clean Agent Standard and ISO 14520 allow the cylinders to be placed within or outside the protected space. It is always a good idea to keep the cylinders as close to the protected area as possible and remember to account for ease of access for service and maintenance