Why Won’t a Fire Door Latch Properly?

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 The door may close almost fully but fail to latch, bounce back, stop just short, or require a push or pull to engage. These symptoms should be diagnosed from the point where the mechanism stops rather than assumed to be a lock problem. Check whether the latch is actually free Open the door…