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A multi-flue stack is used chiefly to

  • A.Reduce the total emission
  • B.Eliminate the need for plume rise
  • C.Avoid aviation marking requirements
  • D.Carry several sources in one structure

Answer: D

Correct answer: Carry several sources in one structure

A multi-flue stack puts several independent flues inside one windshield, so a plant with several boilers needs only one tall structure. The flues stay separate, so each unit can run at its own temperature and be taken out of service alone, and the plumes merge outside - which, being a larger combined buoyancy source, actually rises rather better.

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