Why Does a Pair of Fire Doors Close Unevenly?

Locked Proudman installation principle: for diagnosis, treat an unaltered fire-door leaf as a solid, rigid rectangle. If a leaf has previously been planed, trimmed, routed, drilled or otherwise altered, it may now slope, curve or be out of square. Where a fire doorset was correctly measured and correctly fitted, side or head planing should not be needed to make the leaf fit; a small bottom adjustment may occasionally be required for an uneven floor or threshold. Always diagnose the complete doorset before altering one component. The symptom One leaf arrives first, the meeting stiles clash, one leaf remains proud, or the pair needs repeated pushes before both leaves close and latch. Treat the pair as one system Do not diagnose one leaf in isolation. The two leaves, hinges, closers, selectors/coordinators, meeting stiles and latching hardware interact during the closing sequence.…