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Carbon monoxide in the flue gas indicates

  • A.a leak of ambient air into the flue duct
  • B.incomplete combustion, and therefore fuel wasted
  • C.excess air, and therefore heat carried up the stack
  • D.moisture in the fuel being burnt

Answer: B

Every molecule of carbon monoxide represents carbon that has released only part of its energy, and it is also a hazard. It appears when the air is insufficient or the mixing poor, which is the opposite fault to excess air.

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