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A high flue gas temperature with correct excess air points at

  • A.an oversized induced draught fan
  • B.fouled or scaled heat transfer surfaces
  • C.too much air being admitted to the furnace
  • D.a fuel of lower calorific value than expected

Answer: B

If the gas quantity is right and it is still leaving hot, the heat has not been transferred, and soot on the fire side or scale on the water side is the usual reason. Cleaning restores it, and monitoring the temperature is how the need is detected.

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