The process of creating or constructing flues (ducts or channels that allow smoke, air, or gas to escape, especially from a fireplace or stove).
From 'flue' (a channel for smoke, from Old French 'flue' meaning flowing/flowing out) plus '-ing' (making it a gerund or present participle). Used in construction and masonry trades.
A poorly designed flue can cause smoke to back up into your house or create dangerous drafts—historically, chimney sweeps and masons competed to build the best 'fluing' systems. The science of ventilation in old buildings is surprisingly complex.
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