air duct

noun
an enclosure, usually of sheet metal, that conducts heated or conditioned air.

Origin:
1865–70

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
Provide insulated acoustical air duct connectors in supply air duct systems and
  elsewhere as shown.
Flexible air duct trunk lines should not be limited in length.
Air duct systems in buildings can also become contaminated with mold.
The fact is, many forced air duct systems are clunkers.
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