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Threshold on fire doors

Guest Stephen Cooke
Guest Stephen Cooke
in Fire Doors and Accessories

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Hi quick question.  An I right that a threshold under a interal fire door can be carpet? As there is fitted carpet though out the building? 

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    Yes the threshold can be carpet. However, if the door is required to restrict the spread of cold smoke (most fire doors will be) the gap between the door bottom edge and the floor covering should not exceed 3mm (reference BS 8214 and BS 9999) so it would be better to fit a threshold plate. This would make it easier for the correct threshold gap to be maintained.

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