Door frame seal replacement...?

[GravyMonster]

I've spent far too long trying to find a replacement for this part but i have no idea what to search for:



Its a plastic bead that runs the whole way around my interior garage door and seals it. I need to replace it as its worn thin but my searches arent finding anything close.

Can anyone tell me what this is called or where i can buy some more?

 

[GravyMonster]

Yep its a fire door.

*edit*

Intumescent strip! That's the stuff. Thanks mate, owe you one.

 

[GravyMonster]

Hmmm now you've got me thinking it doesn't need replacing. Like you, I thought it needed to simply be tight to the door and i know its not any longer as its letting an almighty draught through. Thats what i was hoping to stop.