multiple-flue chimney - meaning and definition. What is multiple-flue chimney
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What (who) is multiple-flue chimney - definition

EXHAUST FOR A FIREPLACE, FURNACE ETC.
Chimney-flue; Flues
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Flue         
·noun Light down, such as rises from cotton, fur, ·etc.; very fine lint or hair.
II. Flue ·noun A compartment or division of a chimney for conveying flame and smoke to the outer air.
III. Flue ·add. ·noun In an organ flue pipe, the opening between the lower lip and the languet.
IV. Flue ·noun A passage way for conducting a current of fresh, foul, or heated air from one place to another.
V. Flue ·noun An inclosed passage way for establishing and directing a current of air, gases, ·etc.; an air passage.
VI. Flue ·noun A pipe or passage for conveying flame and hot gases through surrounding water in a boiler;
- distinguished from a tube which holds water and is surrounded by fire. Small flues are called fire tubes or simply tubes.
flue         
[flu:]
¦ noun a duct in a chimney for smoke and waste gases.
?a channel for conveying heat.
Origin
ME (denoting the mouthpiece of a hunting horn): of unknown origin.
Flue         
A flue is a duct, pipe, or opening in a chimney for conveying exhaust gases from a fireplace, furnace, water heater, boiler, or generator to the outdoors. Historically the term flue meant the chimney itself.

Wikipedia

Flue

A flue is a duct, pipe, or opening in a chimney for conveying exhaust gases from a fireplace, furnace, water heater, boiler, or generator to the outdoors. Historically the term flue meant the chimney itself. In the United States, they are also known as vents for boilers and as breeching for water heaters and modern furnaces. They usually operate by buoyancy, also known as the stack effect, or the combustion products may be 'induced' via a blower. As combustion products contain carbon monoxide and other dangerous compounds, proper 'draft', and admission of replacement air is imperative. Building codes, and other standards, regulate their materials, design, and installation.