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Posted by Dr. Hardcrab on January 15, 2008, 7:36 pm
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>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?
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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> 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.