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an air passage (usually in the floor or a wall of a room) for admitting or excluding heated air from the room
breather, schnorchel, schnorkel, snorkel, snorkel breather
air passage provided by a retractable device containing intake and exhaust pipes; permits a submarine to stay submerged for extended periods of time
air passage consisting of a ventilation shaft through which air leaves a mine
a shaft in a building; serves as an air passage for ventilation