I been reading all the old threads and the only objection I see is that if sufficiently heated can give of fumes or toxic gases from the galv. process.
What are the other objections to it? In my town Galvanized is fully accepted by our inspector. He says that as long it is not heated with a torch or heat gun its fine.
Since coal stoves don't have high stack temps I don't see why it can't be used.
But of course, Id like to hear more before collecting my Darwin award.