Gap between door lining and wall

[Rougeone]

I have a 686 door lining but there is a gap of 50mm from lining to internal brick wall,  is this to big for foam ?

 

Thank you in advance 

[Neil ashdown]

The 50mm gap is too large for a timber-based fire door assembly.  Consult 'BS 8214:2016 Timber-based fire door assemblies - Code of practice' for details about maximum gap sizes and suitable fire stopping materials.