Mr

[Guest Nathan]

Hi, do we have any specific guidance regarding opposing intumescent seals in  door frames and door leafs (nominal doors) as far as I am aware this is fail and requires replacement. Also with regard to opposing seals in meeting edges on a single acting double door set, some door manufacturers allow opposing seals according to the certification, but I am wondering about nominal doors

[Neil Ashdown MAFDI]

I haven't yet come across a timber fire door that permits opposing intumescent seals, in the meeting edges of double leaves they would be offset rather than directly opposed. Except for doors with edge protectors that is. You could try https://www.ifsa.org.uk/