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Direct vent gas furnace peels paint
QUESTION:My mother-in-law had both her oil furnaces in her two-family house replaced
with gas. The installers vented them through the foundation to a horizontal
tee, one on either side of the house. The problem is the paint on the
shingles on both sides of the exhaust tee is peeling. This is happening on
both exhausts. It's been about a year since installation.
Is this a common problem with direct vent furnaces? It seems to me that this
is a good enough reason to have a liner installed in the chimney and vent
that way. I can't imagine the price difference between the two methods to be
that great. Any other solutions to the paint-peeling problems?
ANSWER: Are these really "direct vent", where they vent through a "B" style metal tube
and the exhaust gases are hot enough to burn things? Or are they just "sealed
combustion" higher efficiency units that vent through PVC?
I would think that you could have tons of problems venting HOT gases out the
side of the house, but I have never seen paint peeling from the (relatively)
cool exhaust of a high efficiency furnace, and have seen PVC vented though a
roof, but never up a lined chimney.
What part of the country is this?
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