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PVC Combustion Venting

You and I have come across PVC that has gone from white to many colored shades: from light yellow to tan to almost looking like ABS black.

Should PVC schedule 40 pipe and fittings continue to be permitted for combustion exhaust venting? You and I have come across PVC that has gone from white to many colored shades: from light yellow to tan to almost looking like ABS black. We all know that is due to overheating and you, like me, have probably seen deformation from overheating. In some cases, it’s due to PVC having been used for combustion venting for standard (chimney-vented, or should have been!) water heaters, 80%

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