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Venting 80% furnace


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I saw something today that I had not seen before. 80% furnace vented to an exterior masonry chimney with a clay liner. Also venting a water heater. That part is not unusual. The chimney connector has a built-in damper and an opening to allow dilution air to enter the chimney. The instructions state that this allows venting of the furnace without lining the chimney.

Of course, the venting kit is made by Lennox and is listed for use with several models of furnaces. The furnace that was installed is an Aire-flo (there are or were owned by Lennox), but the model numbers do not match. So unless the manufacturer says otherwise, it is still wrong, but interesting to know that this kit exists.

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