Hi ,

in my building built in 2000 there is quite a few timber fire doors in steel frames with no information on them. A door inspector has picked up some faults on them but not mentioned this configuration. I read that timber doors in steel frames might not be compatible so test evidence should be checked. As there is no information on these doors should it be a new doorset as no details can be confirmed.

Some, not all, timber fire door leaves have evidence of fire resistance performance for use in metal frames.  Do you have reason to believe the doors are unsuitable? and how critical are the doors to the fire strategy at the building?  are the sort of questions you should ask. 

If you have concerns over the safety of the doors you could contact a professional fire door inspector at https://afdi.org.uk/category/find-a-fire-door-inspector/ for advice.