All safelincs seals are available for single and double fire doors and can be fitted in the frame or the door leaf.
Gap between double fire doors.
In general the gap should not exceed 3 mm.
When a 1 8 in thick tool fits into the gap with no lateral movement the gap is within nfpa 80 s specifications.
1 8.
Flat seals press against surfaces to create a seal.
They are abrasion resistant neoprene.
3 4 between door and frame.
The filaments are nylon for good wear resistance.
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.
Seal the space between your double doors.
1 8 meeting edges for a pair of doors.
Nfpa 80 fire doors and other opening protectives contains information on maximum gap allowances for different types of fire doors.
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.
British standards set out details on the permitted gaps around a fire door.
Wraparound seals create a seal on both sides of a door.
Under the bottom of a door.
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.
Brush seals have flexible filaments that conform to fill gaps.
In general clearance for those allowed gaps are as follows.
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.