There is a particular boiler manufacturer who is claiming that a slight negative building pressurization has led to a cracked on a cracked heat exchanger on a 2 Million BTU, Category IV Condensing Boiler. Anyone have any experience with this? The negative condition exists but the boiler is sealed combustion and has had no flame failures. It seems to me that if the building pressurization was effecting the boiler then there would have been a flame failure.
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