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The air exchange rate of a room is expressed in

  • A.Air changes per hour
  • B.Cubic metres
  • C.Pascals
  • D.Watts per square metre

Answer: A

It is the volumetric ventilation rate divided by the room volume, so a rate of one means the room volume is replaced each hour. It sets the dilution available to every indoor source and appears in the steady state mass balance directly.

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