Originally Posted By: mpatton
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Steve & Joe,
I do not have a source to quote but I have recently read somewhere the exception to discharging gas furnaces & water heaters into a clay liner is if it has been previously used for an oil fired furnace. Supposedly the oil residue in the liner will react with the gas residue and moisture causing potential for spalding of the clay liner if I remember correctly. They recommended that a metal liner be installed. Now with all of that said, how do you insure that the heating system was always something besides oil?
When dealing with masonry flues I have a typical statement that I do not inspect these and recommend a chimney sweep to inspect for safety.
Can anyone confirm what I have just stated about the spalding of the liner, I will also backtrack and see if I can support the statement.
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