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 uk.
Check for a label or a plug on top or on the side of each door for a fire resistance rating.
I work in a relatively new office buiding that has internal fire doors with cold smoke seals and the gaps under the doors range from 5mm to 10mm.
Fire doors need a seal around the edges which swells when heated to block any gaps if the doors are fitted with windows the glazing must be fire resistant all ironmongery on the doors needs to be fire resistant.
This makes the gap between the carpet and doors around 10 15mm.
Under the bottom of a door.
3 4 between door and frame.
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.
Contains information on maximum gap allowances for different types of fire doors.
1 8 for more detailed gap information refer to nfpa 80 section 6 3 1 7 and section.
Gaps around the fire door should be 3mm or less to stop smoke.
Underneath the fire door a gap of 8mm is traditionally acceptable although for fire doors that are required to limit spread of cold smoke only 3 mm is permissible with a threshold seal to be fitted if the gap is bigger.
If there isn t one it is most likely not a fire door and will not protect you in a fire.
The gap between the door and the frame is extremely important and must be suitable for the intumescent seal fitted.
Nothing must be cut at the top at all and the certification label must remain intact.
All fire doors display certificates and relevant markings to verify their fire integrity.
It should be 8 10mm max from bottom of the door to the surface onto which the carpet etc is laid.
In general clearance for those allowed gaps are as follows.
Please could you confirm or otherwise my understanding that the maximim 8 10mm gap usually cited as permissible at the bottom of the fire door should be to allow for the carpet i e.
Fire doors basic guidance.
How much can you cut off a fire door.
1 8 meeting edges for a pair of doors.
Gaps between fire doors and the door frame should never be more than 4mm or less than 2mm.
Fire and hot gases can easily pass through gaps around the door within seconds and so to ensure the safety and reliability of the door always fit.
Regulations which apply the directive and its requirements in the uk.
Nfpa 80 fire doors and other opening protectives.
