I could also elaborate further into this topic 🙂
Doors
When checking if a door has the appropriate width for escape routes, it is the nett width of the door (distance from inner frame until the door leaf in 90°) instead of the total opening for that door. Checking the total opening is not very precise, since there are different door frames (thicker or wider) which would influence the results.
Area/Person (Fläche/Nutzer)
This makes sense more for office buildings where it is regulated how many workers can be located per m². This then influences all other factors such as door width.
But with residential buildings (in Austria and Germany) it is not the m² that decides on how many people are going to escape, but more the number of rooms. So a living room with 30m² will have a different number than an office with that area.
There are additional details that are country specific, but I don’t want to open pandoras box 😊