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Cornwall firedoors

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  1. Just after people’s thoughts, advice etc, we’ve been fitting fd60 firedoors and on the whole attaining a 3mm gap between floor and door, but as nothing is plumb and level in places the gap is bigger and with floors rising as door opens in its closed state the gap can sometimes be over 5mm, drop seals are not an option, is this an allowable gap under the circumstances ?? thanks in advance
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