Do fire doors over 2040mm require 20mm fire door seals?

[Guest EddieMCK]

Hi, A contractor has installed a 20mm wide groove in the door frame head for the intumescent smoke seal, whilst on the jambs it's only 10mm. We only require a 30 minute fire rating so I thought 10mm was acceptable on jambs and head. However they have said new regulation state that doors over 2040mm high must have a 20mm wide groove? Is this correct? Many thanks, Eddie

[AnthonyB]

The only reference to seal width I can find is purely based on door fire resistance and nothing to do with size. The recommended seal size for most modern 30 minute doors, other than doorsets, is 15mm X 4mm. The recommended seal size for most modern 60 minute fire doors is 20mm X 4mm, or 2 No. 10mmX4mm.

This is from   BWF-CERTIFIRE  who are the fire door industries' Scheme to ensure the correct standards are used in relation to fire doors and their installation