Why Does a Fire Door Close Then Reopen?

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. Why does it close and then open again? When a fire door closes onto the frame and then pushes back open, the first mistake is to blame the closer. The symptom is a closing problem, but the resistance can be anywhere in the doorset. The latch may be striking the lock strike plate rather than…