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The guidance you need as follows:

BS 8214: 2016  https://shop.bsigroup.com/ProductDetail/?pid=000000000030332501

IFSA https://www.ifsa.org.uk/documents 

Unless the brush seals are offset, there shouldn't be room for two brush seals as the gap between the edge of the door leaf and the frame should generally be 4mm max and 2mm min. Same for the gap at the meeting edges of double leaf doors.

Be careful to ensure that the brush seals do not prevent the doors from self-closing completely.  In the door closed position, the brush (or blade) should only lightly contact the surface that it sweeps.


Edited by Neil ashdown
To correct typing error
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