Definition of "flues" [flues]

• Plural form of flue. (noun)

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• "Passive-houses built of healthy materials have also been proven to reduce the spreading of flues, meaning fewer sick-days for children and adults. 
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• "Under the floors ran flues through which the kitchen smoke escaped, warming the sleeping-room in its passage."
• "Air can get in around windows and doors, around recessed lights, around plumbing vents, wiring holes, switch and outlet covers, furnace flues and chases and around the frame work such as rim joists and soffits."