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Fire door gaps

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No recent changes to gap requirements.  These should be in accordance with the door leaf manufacturers installation instructions, product data sheet or technical manual. 

Usually, that means the gap between the door leaf and door frame at the vertical edges and top edge should be minimum 2mm and maximum 4mm.  At the threshold the gap between the door bottom edge and the floor covering or threshold plate should be 3mm maximum where cold smoke protection is a requirement. Clearly, HMOs will require cold smoke protection.

Where a max 3mm gap cannot be achieved it is permissible to fit a threshold smoke seal to fill the gap, but the gap between the door bottom edge and the floor covering or threshold  plate should not be more than 10mm.  Where cold smoke protection is not a requirement the bottom gap should not exceed 10mm.


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