Do door knobs have to be fire rated?

[Guest E Kitis]

In a small block of flats (3 floors) we have external flat doors FD30, with intumescent seals, etc. all fitted, and door closers. We want to fit both external and internal door handles as the doors are heavier with the closers. Should door handles/knobs  be fire rated at all? To my mind, if they do, only the internal ones need be, but not the external ones on the side of the stairwell. Can you advise? Thanks 

[Neil ashdown]

The handles do not need to be fire rated.  However, the installation works for the handles must not compromise the fire and smoke resistance performance of the fire doors.