Gap Between Double Fire Doors

Bs 8214 2008 states that the gap along the sides top and between the leaves of a double door should be 3 mm 1 mm. Wraparound seals create a seal on both sides of a door. To facilitate the checking of this gap on site the bwf certifire fire door and doorset scheme has produced a gap tester which can be used for this purpose.

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1 8 meeting edges for a pair of doors.

Gap between double fire doors.

Gaps between fire doors and the door frame should never be more than 4mm or less than 2mm. For example the maximum door gap dimension for 3 4 hour and greater rated wood fire doors is 1 8 in no over tolerance dimension is permitted. They are abrasion resistant neoprene. British standards set out details on the permitted gaps around a fire door.

The door gap the gap between the door leaf and the frame must be suitable for the intumescent seal fitted. 3 4 between door and frame. When a 1 8 in thick tool fits into the gap with no lateral movement the gap is within nfpa 80 s specifications. The filaments are nylon for good wear resistance.

It s recommended to aim for a 3mm gap to ensure adequate room for the intumescent strips to activate in the event of a fire and for the smoke seal strips if installed to not get damaged by the opening and closing of the door. Double doors can make a grand impression at the main entrance to a home but if there is a gap between them they re losing a lot of heat. Flat seals press against surfaces to create a seal. Nfpa 80 fire doors and other opening protectives contains information on maximum gap allowances for different types of fire doors.

All safelincs seals are available for single and double fire doors and can be fitted in the frame or the door leaf. If the doors are solid wood they are susceptible to swelling and shrinkage in response to changes in the weather and these shifts are magnified in the case of double doors. Brush seals have flexible filaments that conform to fill gaps. In general clearance for those allowed gaps are as follows.

Under the bottom of a door. In general the gap should not exceed 3 mm. Seal the space between your double doors. 1 8.

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