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 seal has paint on it, is stuck to the frame, looks compressed or damaged, or appears to have changed after decorating. Look at the full seal Check continuity, condition, location and whether paint or finish has bonded the seal to another surface. Do not inspect only the area that is easiest to…
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