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Displacement ventilation differs from mixing ventilation in that it

  • A.Recirculates all the air through filters
  • B.Depends entirely on infiltration
  • C.Buoyancy carries contaminants upward
  • D.Mixes supply air uniformly through the space

Answer: C

Because the contaminated warm plume rises above the occupied zone and is extracted at ceiling level, the breathing zone sees air closer to supply quality. It works well for heat and buoyant contaminants and poorly for dense ones released at low level.

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