Best practice guidance states that the gaps at the sides and top of a timber fire door should be between 2 and 4mm.
Fire door gaps.
What gaps are required around a door and its frame.
You can measure the gap with a simple gap gauge.
Ngp s gap90 head jamb 9590.
3 4 clearance between door and frame.
Under the bottom of a door.
3 4 between door and frame.
The old test of fire doors to bs 476 part 8 for fire resistance was carried out simply in a furnace increasing the temperature to that found in rooms on fire and the door was checked to ascertain when the fire would breach the door usually at the gaps at the head and sides of the door.
Nfpa 80 fire doors and other opening protectives contains information on maximum gap allowances for different types of fire doors.
Nfpa 80 fire doors and other opening protectives.
Whether at the head jamb or door bottom excessive gaps put lives at risk.
1 8 for more detailed gap information refer to nfpa 80 section 6 3 1 7 and section.
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The gap between the door and the frame is extremely important and must be suitable for the intumescent seal fitted.
Clearance for under the bottom of a door.
1 8 meeting edges for a pair of doors.
In general clearance for those allowed gaps are as follows.
Safelincs provides gap gauges free of charge on request.
In general those allowed gaps are as follows.