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posted on 9/17/2007
I would like to replace my old forced air furnace with a high efficiency furnace.  The existing installation has both the hot water heater and furnace exhaust vented through the roof via a 8 inch double walled chimney pipe.  Intake air is just supplied via the large basement (air leaks).
How can I run two 3" PVC pipes up to the roof via the existing chimney and still vent the old hot water heater?
Side venting is not possible.
Thanks for you help.

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