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Old 11-20-2008, 09:49 AM   #31
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Has anyone updated to high efficiency gas furnace?

Originally Posted by hvaclover View Post
Mi code requires a four inch liner for a lone vented draft hooded appliance to keep the fumes from cooling down into hydrochloric acid(no joke).

That will eat into your mortar and freeze and cause bricks to separate from hydraulic pressure.

the liner is an insulator to prevent damage to your chimney.
was told that the chimney liner will be 4" if I go with the 95% furnace or 5" if I do 80.

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