The gap between the door and the frame is extremely important and must be suitable for the intumescent seal fitted. In general the gap should not exceed 3mm along the 2 long edges and across top of the door leaf to facilitate checking of the gap on site a bwf fire door alliance scheme gap. Nhbc risk guide fire blocks revised may 2020 refer to nf36 ad b2 hb2557 12 09 nhbc standards te 18 te 22 te 24 bs9991 bs9999 bs8214 hse fire safety in construction.
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