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A couple venting questions
I am trying to better understand a few things with venting boilers.
There are two situations I have come across in the field that I felt were not correct.
One situation had two old firetube boilers, and one atmospheric water heater all venting into a common chimney. The cat I firetube boilers were replaced with cat IV, positive condensing, boilers, and each had it's own vertical vent installed in the chimney using it as a chase. But the old atmospheric water heater was left connected to the chimney and in operation, meaning it is now venting into a chimney that has two other vents inside of it. Is my assumption that this is incorrect, correct? I am reading the 2015 IFGC code and cannot find anything allowing this.
The other situation was another replacement of firetube boilers with condensing boilers. Four new category II - negative draft condensing boilers were connected to the existing chimney, no liner. Can condensing boilers connect to a old masonry or clay lined chimney? Is there a specific liner that can be installed down the chimney to allow this?
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