Why Are Fire Door Seals Causing Resistance?

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 suddenly feels harder to open or close, catches against the seal, or reaches the final closing stage but cannot overcome seal resistance. Start with what changed Recent seal replacement is strong diagnostic evidence. Compare the old and new seal type, dimensions, location, continuity and contact pattern. Timing raises the priority of…