I have new American Standard oil furnace with an outside exhaust vent. Getting "white powder" on seams of galvinized flue pipe? Any ideas what this is?
It is the zinc galvinisation oxidising. Not a majior consern untill you see red brown rust then have the vent replaced.
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Other people asked questions on various topics, and are still waiting for answer. Would be great if you can take a sec and answer them
