minimum gap

[Nephelim]

I'm inspecting firedoors where the gap at jamb is so tight you could barely fit a sheet of paper in. 

The data sheet and the fire test report only mention maximum allowable gaps. BS8214 (9.5.2) says that a typical gap should be 2 mm to 4mm.

 

Is there a minimum allowable gap? Should I accept these doors?

Thanks.

 

[Martinus]

If the door still closes ok then it is fine. 
 

[Neil Ashdown MAFDI]

The problem with tight gaps is that the door could bind on the frame and fail to self-close correctly.  Always reference the BS 8214 guidance in your report.