Return flue


  • Webster's Revised Unabridged Dictionary
    • Return flue in a steam boiler, a flue which conducts flame or gases of combustion in a direction contrary to their previous movement in another flue.
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In literature:

He returned there, and put more wood on the fire, so that it blazed up brightly, and the sparks shot up the flue with a roar.
"The Rival Campers Ashore" by Ruel Perley Smith
The outlet or return flue passes back through the width of the tank and opens independently to the exterior.
"Encyclopaedia Britannica, 11th Edition, Volume 14, Slice 3" by Various