Clark writes:


Big time corrosion potential with all that water vapor and CO2. Carbonic acid
is a problem with any combustion gas...

Note that mufflers rust out. There's a reason why, and the exhaust gas is it.

On a home furnace, you use a clay or PVC flue.

[It's less of an issue when the muffler/flue gets HOT and stays hot. It's the
cooler ones where the gases condense that get you..]


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