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