duct, epithelial duct, canal, channel (noun)

a bodily passage or tube lined with epithelial cells and conveying a secretion or other substance

"the tear duct was obstructed"; "the alimentary canal"; "poison is released through a channel in the snake's fangs"

duct (noun)

a continuous tube formed by a row of elongated cells lacking intervening end walls

duct (noun)

an enclosed conduit for a fluid

duct (Noun)

A pipe, tube or canal which carries air or liquid from one place to another.

duct (Noun)

An enclosure or channel for electrical cable runs.

duct (Noun)

Guidance; direction.

duct (Verb)

To channel something through a duct (or series of ducts)

Duct

Ducts are used in heating, ventilation, and air conditioning (HVAC) to deliver and remove air. These needed airflows include, for example, supply air, return air, and exhaust air. Ducts also deliver, most commonly as part of the supply air, ventilation air. As such, air ducts are one method of ensuring acceptable indoor air quality as well as thermal comfort. A duct system is often called ductwork. Planning, sizing, optimizing, detailing, and finding the pressure losses through a duct system is called duct design.