- an enclosure, usually of sheet metal, that conducts heated or conditioned air.
Origin of air duct
First recorded in 1865–70
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for air duct
But who would think of putting a burglar alarm on an air-duct?The Romantic Analogue
The ancient conception of the artery as an air-duct gave rise to the derivation from Gr.
These fishes have lost the air-duct and on the whole they show the greatest development of the greatest number of structures.A Guide to the Study of Fishes, Volume 1 (of 2)
David Starr Jordan