Smoke passing through fire door hinges

[Hugh Riddle]

The seems no systematic/designed solution ,to stop smoke passing through most fire-rated door hinges: between the leaves; through the spaces between the leafs and the knuckle (see white wire in .jpg below); around the knuckle. I can't find a fire-rated smoke seal for hinges and can only imagine a fire-rated adhesive foam - similar to a window draught excluder strip.

BTW please, how far should the knuckle or its pin best be positioned from the jambs?   
 

Edited Wednesday at 09:19 by Hugh Riddle
to maximise clarity

[Neil ashdown]

The Standards for restricted spread of ambient temperature smoke, BS 476 part 31.1 and BS EN 1634-3, do permit leakage to a defined limit in the pressure test. Therefore smoke protection around doors should not be viewed in absolute terms. For more on smoke seals visit https://www.ifsa.org.uk

The knuckle of the hinge should be positioned up to the door frame jamb and door leaf face so as to avoid 'door growth' in operation of the door.  Refer to the ASDMA best practice guidance at https://asdma.com/