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90 yo zig zag chimney

We recently had the chimney inspected in our 90 yo stone colonial and we were told that the furnace flue was oversized and that it sloped DOWNward for about 4 feet before making a turn and then went up the chimney. At the turn there are old terra cotta tiles that have fallen down. From the top of the chimney looking down, the flue is in good shape with a good draft. The water heater flue joins the furnace flue at a right angle which is also a code violation.
We have gotten several opinions which range from:
1. tear down the masonry wall and rebuild the chimney with the proper slope and insert a stainless steel chimney liner
2. get a new ventless boiler
3. don't worry about it, it has been this way for many years and is not dangerous.
I am confused about what the correct approach should be. We have already spent a bit of money getting opinions and I feel like I still don't know what the right thing to do is.
Any suggestions would be greatly appreciated.

Re: 90 yo zig zag chimney

first thing first get a carbon monoxid tester "quick" in the room
" call around to several service reps and get some opinions

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