Air duct

an enclosure, usually of sheet metal, that conducts heated or conditioned air.
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.
Farmers’ Bulletin 1230 – Chimneys & Fireplaces A. M. Daniels


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