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10-21-2012, 12:27 PM #35I attached to pictures. If you go by the code, the chimney adapter installed on the OP furnace is illegal because it retards the flow of exhaust gases. If you had a combustion analyzer you could verify this in 5 minutes.
Also, another document that states the code book is consensus and has never been field tested...
Hmmm.........i think i would believe field tested data with my analyzer then some theory in a book.
I wasn't suggesting this so called chimney adapter. I believe a properly sized chimney liner in the masonry, then transitioning to b-vent to the furnace is the best and only way to go