02-08-2008, 12:33 AM
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Deity
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Join Date: Jul 2004
Location: Saint Regis Falls, NY, USA.
Posts: 3,401
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is your furnace and the water heater both natural gas or propane? if one or the other then exhausting the burnt gases into the same flue is ok. you can't mix two different exhaust gases like a wood or coal stove into the same chimney flue as nat gas or propane.
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