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air duct

an enclosure, usually of sheet metal, that conducts heated or conditioned air.
Origin of air duct
1865-70 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the Web for air duct
Historical Examples
  • Nerve and air duct, therefore, are the essentials; the rest is so much material in reserve for the process of the metamorphosis.

    The Life of the Fly J. Henri Fabre
  • Thus the efficiency of fireplaces may be materially increased, the degree depending upon the character of the air duct installed.

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