A flue is a pipe, or opening in a chimney for conveying exhaust gases from a fireplace, furnace, water heater, boiler, or generator to the outdoors. Historically the term flue meant the chimney itself. [1]

The meaning of FLUE is an enclosed passageway for directing a current.

FLUE definition: 1. a pipe that leads from a fire or heater to the outside of a building, taking smoke, gases, or…. Learn more.

A flue is a pipe or long tube that acts as a chimney, taking smoke away from a device such as a heater, fire, or cooker. The chimney flues were repaired and relined.

FLUE definition: a passage or duct for smoke in a chimney. See examples of flue used in a sentence.

A barely perceptible contrail of flue gas extends from the refinery's stack in the distance all the way to this massive and artificial cloud.

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Definition of flue noun in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.

Dec 29, 2025 · flue (plural flues) A pipe or duct that carries gaseous combustion products away from the point of combustion (such as a furnace). quotations

flue conduit for smoke, as in a fireplace: Be sure to open the flue before lighting the fire.