Are draught excluders allowed on fire doors?

[Guest Gavin Wood]

I have a question that I have not found an answer to on your forum and wonder if you could help. I have been asked to find out if it is permissible to add draught excluder to a fire door? Your advice would be appreciated. These are nominal fire doors situated at the top of a flight of stairs leading into an office. Thank you in advance for your help.

[Tom Sutton]

If you use cold smoke seals they will make excellent draught excluders for sides and top. If it’s the threshold and there is less than 10mm between the door and the finished floor then I cannot see any objection to fixing a conventional draught excluder providing it doesn't interfere with the operation of the door.