Why Does a Fire Door Closer Arm Slip or Change Position?

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 closer previously worked but the arm now appears to sit differently, the door no longer closes correctly, or the two-part arm joint has changed position. Check the joint first On a two-part closer arm, inspect the connecting screws and the joint between the arm sections. If the joint has opened, slipped or…