> Fa3ien wrote:

>>
>>> (I just reliased... Every single doorway in the place has a unique ID 
>>> written on it. Wow.)
>>
>> That's pretty normal. The drawing is probably linked to some spreadsheet
>> saying how much doors of what type are needed.
> 
> I wonder if that's what "FD30SC" means? (Every door seems to have this 
> written next to it, in addition to a unique number of the form "DB7".)

for example, we name our doors like :
PSF-93-10
09F 2.20
(both symbols grouped in an hexagon)

which means :

Porte Simple Feu (Single door, fire resistant)
93 cm leaf in a 10 cm wall

the lower symbol is the room to which the door gives access

09 (underground, 00 is ground, 01 1st level...)
F : zone F (fire detection zone)
2.20 : hierarchic geographical numbering within a zone

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