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Fire door full frame

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Hi there,


I have a question regarding the gap at the bottom of the door, I have a riser door with a full frame all around, but at the bottom, the so-called threshold is part of the frame, my question is if this gap is treated as a gap around the (2mm - 4mm) or as a bottom gap up to 10mm. 


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Noting that the bottom part of the door frame has an intumescent edge seal, I would work on a 2mm to 4mm gap.  Have you checked with the door leaf or door-set manufacturer?  It would be interesting to see what they require. 

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