: an enclosed passageway for directing a current: such as
a
: a channel in a chimney for conveying flame and smoke to the outer air
b
: a pipe for conveying flame and hot gases around or through water in a steam boiler
c
: an air channel leading to the lip of a wind instrument
d
Examples of flue in a Sentence
Recent Examples on the Web
Chinese media described the process as a closed system in which flue gas enters one end of the pipeline and fertiliser emerges from the other.
—
Bojan Stojkovski, Interesting Engineering, 17 May 2026
Fireplace dampers are movable metal or ceramic plates inside the chimney flue (often right above the firebox), designed to control airflow in and out of the chimney.
—Kamron Sanders, The Spruce, 4 Mar. 2026
Use only chimneys and flues that have been cleaned and inspected annually.
—Staff Report, Hartford Courant, 6 Feb. 2026
Close fireplace flues when not in use and follow gas fireplace guidelines.
—Brendel Clark, Freep.com, 17 Jan. 2026
See All Example Sentences for flue
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Bojan Stojkovski, Interesting Engineering, 17 May 2026
Fireplace dampers are movable metal or ceramic plates inside the chimney flue (often right above the firebox), designed to control airflow in and out of the chimney.
—Kamron Sanders, The Spruce, 4 Mar. 2026
Use only chimneys and flues that have been cleaned and inspected annually.
—Staff Report, Hartford Courant, 6 Feb. 2026
Close fireplace flues when not in use and follow gas fireplace guidelines.
—Brendel Clark, Freep.com, 17 Jan. 2026
See All Example Sentences for flue
Cite this Entry
“Flue.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/flue. Accessed 21 May. 2026.
Copy CitationKids Definition
flue
noun
: an enclosed passageway for directing a current
especially
: a channel in a chimney for carrying flame and smoke to the outer air
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