How to Say "flue" in Spanish
The Spanish word for “flue” is “chimenea” — A2 level. This is a very common word in everyday Spanish.
English → SpanishA2
nounA2
The passage for smoke

Examples
El deshollinador subió al tejado para limpiar la chimenea.
The chimney sweep climbed onto the roof to clean the chimney.
Las chimeneas de la fábrica emitían mucho vapor.
The factory smokestacks were emitting a lot of steam.
Context is Key
The meaning is usually clear from context: if you're talking about the roof or a factory, it means the vertical pipe; if you're talking about sitting nearby, it means the indoor structure.
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