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Stan meadows

Gaps between a fire door and frame.

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Cold smoke seals should not have a 3mm gap otherwise they won't work, they should be as close fitting as possible without making the door stick, which is a good reason to use approved specialists for fire door work so it's correctly installed.

 

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On 8/21/2017 at 23:09, Stan meadows said:

What should the gap be below the fire door? 

Your second question I assume you are talking about the threshold gap and according to BS 9999, it says,

When installed, the threshold gap should where practicable be sealed by a (flexible edge) seal either with a leakage rate, not exceeding, 3 m3/h per metre at 25 Pa or just contacting the floor, giving an even contact with the floor but not exhibiting significant increased frictional forces that could interfere with the closing action of the door. Where this is impracticable, the threshold gap should not exceed 3 mm at any point.

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The smoke seal brush or blade should lightly contact its opposing surface so that spread of cold smoke can be restricted. There are several types of smoke seal so that binding or sticking doors shouldn't be a problem. Top class guidance documents here:  http://ifsa.org.uk/docs.html 

Remember too that the fire door (unless FDKL) must self-close correctly overcoming any resistance from seals or latch bolt/strike as part of the self-closer action and without any other help!

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Guest Alan Clark

My council is changing all its flat entrance fire doors for new FDs 30 ones. However the doors are being assembled to their frames on site and most of the doors have gaps between their frames of over 6mm. The doors do close onto a seal all around the front, but the gap at the sides is excessive. Also light from the communal hallways can be seen at the bottom of the door, is this correct?

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The gaps for an FD30s fire door should be 3mm +/- 1mm top and sides and brush seal should be fitted, the threshold gap should be 3mm, if not a threshold brush seal not exceeding 8mm, need fitting. 

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