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|Noun||1.||air duct - a duct that provides ventilation (as in mines)|
duct - an enclosed conduit for a fluid
register - an air passage (usually in the floor or a wall of a room) for admitting or excluding heated air from the room
schnorchel, schnorkel, snorkel breather, breather, snorkel - air passage provided by a retractable device containing intake and exhaust pipes; permits a submarine to stay submerged for extended periods of time
upcast - air passage consisting of a ventilation shaft through which air leaves a mine
ventilation shaft - a shaft in a building; serves as an air passage for ventilation