I have an oil burning furnace that has developed a small leak in the
exhaust pipe that leads outdoors. The holes looked as if they had
burned through due to the heat. Unfortunately when the furnace is on I
sometimes smell a little exhaust in the basement close to the furnace
as the exhaust is leaking out through one of two very small holes.
During my annual maintenance similar holes (very small) were sealed by
the repair man using a thick red sealant that he dabbed over the hole
with his finger. Just wondering what type of sealant he used and where
I might be able to find it?
Thanks for your help.
It is probably high temp RTV. If your exhaust is rotting out, it
should probably be replaced. Depending on the length, it shouldn't be
more that $30 worth of 26 gauge pipe, unless you have B-vent or
The hole was probably put there on purpose. About the size of a thick
pencil? That is where they will do their efficiency
test after cleaning. It probably should be filled in, but it's not going to
hurt anything. Think about it:
Doesn't your smoke pipe have a draft regulator on it? (It's that "flapper"
thing that squeaks and bangs when the wind blows). Look how big THAT hole
is! If it IS in fact holes that have burned through, it sounds like all of
your pipe needs to be replaced. If it's just a hole that needs to be
patched, get some high temp RTV sealand or simple furnace cement and seal
it. Otherwise, don't sweat it.
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