Fire Door Floor Gap

Diagram 2 2 5 the capacity of exit doors to each residential unit corridor exit doors to staircases and exit passgeways are measured in units of width of one half of a metre i e.

Fire door floor gap.

Clear width of exit door corridor staircase number of unit widths 1m 2 1 5m 3 2m 4. How much can you cut off a fire door. The smoke and the fire will try to push through the side and top gaps around a fire door while usually drawing air from underneath the door. The development of fire door testing.

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. Also too large gap hinders reliable fixing of doors in the closed position. The maximum gap allowed for a fire door is generally 10mm between the door bottom edge and the floor covering. The maximum gap for a fire door with smoke protection is 3mm but if this is not possible a gap of up to 10mm is permissible with the use of a smoke seal to seal the gap at the door bottom edge.

Is this just a guideline or is this the law and needs to be strictly adhered to and if the fire doors gaps are less then this minimum amount or more than this maximum amount are they considered illegal in the eyes of the law and will need correcting. For fire doors the building regulations state an equal gap of a minimum 2mm gap and a maximum 4mm gap between the fire door leaf and frame. Under the influence of moisture door can expand and then problems with its functionality cannot be avoided. 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.

Nothing must be cut at the top at all and the certification label must remain intact. Bs 476 pt 22 as 1530 pt 4 astm e119 iso 834 or nfpa 251 or 2. Fire rated door 11 1. The occupants on that floor at the time of evacuation.

Ss 333 includes fire resistance test air leakage test spring force test and closing reliability test 21. Ss 332 bs 476 pt22 22. Further operation of the door structure depends on how well gaps will be calculated and put.