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Posted by Harold hydronicnetwork.net on December 03, 2003 at 16:27:55:
In Reply to: Leak in vent pipe posted by Judy on December 03, 2003 at 15:49:08:
The problem is that the furnace is efficient, so it doesn't keep the chimney warm enough to prevent the product of combustion, water, from condensing inside the vent, so it is running back down the pipe. It will rot the pipe. Have a professional look at the vent, it might need to be changed to a double-wall of the right type.