air flue

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An incombustible, heat-resistant enclosed passage in a chimney to control and carry away products of combustion from a fireplace to the outside air. Often, several fireplaces within a home are connected to a single large flue, but it is also common to carry up one flue for each fireplace.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
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