In general the gap should not exceed 3mm along the 2 long edges and across top of the door leaf to facilitate checking of the gap on site a bwf fire door alliance scheme gap.
Fire door gaps.
Contains information on maximum gap allowances for different types of fire doors.
In general clearance for those allowed gaps are as follows.
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.
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.
Safelincs provides gap gauges free of charge on request.
In general those allowed gaps are as follows.
Nfpa 80 fire doors and other opening protectives.
Whether at the head jamb or door bottom excessive gaps put lives at risk.
Ngp s gap90 head jamb 9590.
How big should gaps around fire doors be.
1 8 for more detailed gap information refer to nfpa 80 section 6 3 1 7 and section.
1 8 meeting edges for a pair of doors.
3 4 clearance between door and frame.
Nfpa 80 fire doors and other opening protectives contains information on maximum gap allowances for different types of fire doors.
What gaps are required around a door and its frame.
You can measure the gap with a simple gap gauge.