flue
B2Technical, Everyday, Construction/Architecture
Definition
Meaning
A pipe, tube, or duct for carrying smoke, gas, or hot air from a fireplace, furnace, boiler, or other heating appliance to the outdoors.
More generally, a passage for conveying air, gas, or smoke; in plumbing, it can refer to an exhaust pipe. Figuratively, it can describe any channel or conduit.
Linguistics
Semantic Notes
The term is most specific to heating systems and chimneys. It is a countable noun. A 'flue' is a component part of a chimney or exhaust system.
Dialectal Variation
British vs American Usage
Differences
No significant difference in meaning or core usage. Both varieties use the term identically for the specific part of a chimney/heating system.
Connotations
Technical/neutral in both varieties.
Frequency
Similar frequency; the word is used when the context (home maintenance, construction, HVAC) arises.
Vocabulary
Collocations
Grammar
Valency Patterns
N of N (flue of the chimney)V + N (clean/block/inspect the flue)Adj + N (blocked/insulated/metal flue)Vocabulary
Synonyms
Strong
Neutral
Weak
Vocabulary
Antonyms
Phrases
Idioms & Phrases
- “Up the flue (slang, meaning ruined, lost, or wasted)”
- “Go up the flue (to be lost or wasted)”
Usage
Context Usage
Business
Rare, unless in the HVAC (heating, ventilation, air conditioning) industry.
Academic
Used in engineering, architecture, or environmental science texts discussing combustion or building systems.
Everyday
Common in contexts of home maintenance, discussing fireplaces, boilers, or wood-burning stoves.
Technical
Central term in heating engineering, construction, and plumbing.
Examples
By Part of Speech
adjective
British English
- The flue pipe needs replacing.
- Flue gas analysis is important for safety.
American English
- The flue liner is cracked.
- Flue damper controls the draft.
Examples
By CEFR Level
- Smoke goes up the flue.
- We have a fire in the fireplace; the flue is open.
- Before winter, you should check that the boiler's flue is not blocked.
- The bird built a nest in the chimney flue.
- A blocked flue can cause dangerous carbon monoxide to build up in the house.
- The engineer recommended installing a stainless steel flue liner for the old chimney.
- Modern high-efficiency condensing boilers require a specific type of plastic flue for their acidic exhaust gases.
- The study analysed particulate matter emissions from various domestic flue systems.
Learning
Memory Aids
Mnemonic
Think of 'FLUe' as the 'FLU' or 'FLU'id passage that smoke FLU-ids through.
Conceptual Metaphor
A CHANNEL IS A BODY PART (e.g., 'the chimney's throat'), A PASSAGEWAY FOR WASTE/EXHAUST.
Watch out
Common Pitfalls
Translation Traps (for Russian speakers)
- Do not confuse with 'грипп' (the illness influenza). 'Flue' and 'flu' are homophones but unrelated.
- The closest Russian equivalent is 'дымоход', not the more general 'труба' (which could be any pipe).
Common Mistakes
- Misspelling as 'flew' (past tense of fly) or 'flu' (the illness).
- Using it as a verb (e.g., 'to flue a chimney' is non-standard; 'to sweep/clean a flue' is correct).
Practice
Quiz
What is a 'flue' most specifically?
FAQ
Frequently Asked Questions
No, a flue is the internal pipe or duct *inside* the chimney structure that carries the smoke. The chimney is the entire brick or stone structure housing the flue.
Yes, though less common. It can refer to any exhaust duct, like from a laboratory fume cupboard or an industrial furnace.
A 'flue' is specifically for hot exhaust gases (from combustion). A 'vent' is more general for any air passage (intake or exhaust), like a bathroom vent.
They are homophones (sound identical: /fluː/). 'Flu' is short for influenza, a disease. 'Flue' is the chimney pipe. The spelling and meaning must be learned in context.