Fire Door Gaps

Nfpa 80 fire doors and other opening protectives.

Fire door gaps.

Under the bottom of a door. What gaps are required around a door and its frame. 1 8 meeting edges for a pair of doors. Safelincs provides gap gauges free of charge on request.

In general those allowed gaps are as follows. 3 4 clearance between door and frame. In general clearance for those allowed gaps are as follows. Ngp s gap90 head jamb 9590.

Nfpa 80 fire doors and other opening protectives contains information on maximum gap allowances for different types of fire doors. The gap between the door and the frame is extremely important and must be suitable for the intumescent seal fitted. You can measure the gap with a simple gap gauge. 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.

Clearance for under the bottom of a door. 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. Whether at the head jamb or door bottom excessive gaps put lives at risk. How big should gaps around fire doors be.

Best practice guidance states that the gaps at the sides and top of a timber fire door should be between 2 and 4mm. 1 8 for more detailed gap information refer to nfpa 80 section 6 3 1 7 and section.