Gap Between Double Fire Doors
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3 4 between door and frame.
Gap between double fire doors. Contains information on maximum gap allowances for different types of fire doors. Worryingly the fire door inspection scheme fdis recently highlighted that three quarters of all fire doors inspected in 2019 were condemned as not fit for purpose. 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. When a 1 8 in thick tool fits into the gap with no lateral movement the gap is within nfpa 80 s specifications.
In this case an allowance should be made for the degree of bevel. I understand that the gap around a door should be no more than 3mm 1mm to allow the intumescent seal to expand although there is more leeway with the bottom of it. If you own a commercial or non domestic property there are strict regulations and guidelines to follow ensuring the doors can withstand certain heats. 1 8 for more detailed gap information refer to nfpa 80 section 6 3 1 7 and section.
Under the bottom of a door. Under door threshold gaps should be in accordance with the manufacturer s installation instructions for the particular doorset design. 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. Where you have a double leaf door set what is the permissible gap between the cold smoke seals on each door.
The lsc does not specify a minimum gap for corridor doors of 1 8 inch and in addition the lsc specifically states that compliance with nfpa 80 standard for fire doors and fire windows is not required 18 19 3 6 3 1. Control of door gaps gaps between fire doors and the door frame should never be more than 4mm or less than 2mm. Nfpa 80 fire doors and other opening protectives. The meeting edge clearance between double egress pairs of doors measured from one side only may potentially exceed 3 16 since the measurement would be from the pull side of one door to the push side of the other door.
Therefore it is incorrect to apply the 1 8 inch gap. 1 8 meeting edges for a pair of doors. In general clearance for those allowed gaps are as follows.
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