Insulation storage

Ok Group, we have a LARGE Insulation manufacturing location nearby. The "Hot" side where the silicate and other materials are melted and spun into wool, is a Group F-1; and the four adjacent warehouse areas are S-1. The entire complex is of non-combustible construction, and is also fully fire sprinkled. They currently have OLD fire doors between the major spaces, and the warehouses. It is not (IMHO) a code requirement to have these doors, and the planning dept. has allowed the oversize project, as it is separated on at least two sides, and is fully sprinkled.
They are asking me, to write up a letter that states what I have mentioned in this posting,,,, do you see any issues with my logic?
They do not necessarily want to remove the fire doors, they just don't want to test them; they are prone to damage, and due to their age and size, replacement parts are expensive.
Original Post
Dog,
If the place was first permitted in the late 1970's as an insulation plant, then there is no occupancy separation per code of the day. Factories of non combustible without flammable materials as part of the processes were exempt from "occ sep" as storage was considered part of the main occ grp. This was typical of the two I was involved in during that era. If this is a change of occupancy, then code of the day for when occupancy changed is applicable and may not allow unseparated occupancy areas.

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