Hi, I am preparing for an oil to gas heating conversion; Warm forced air furnace and 50 gallon separate hot water heater. I am using high efficiency gas furnace and hot water heater and will vent them outside via PVC pipe. Can I use my abandoned chimney flu as a combustion air intake for both devices? The flu is located 3 feet behind the furnace and hot water heater. The square inch area of the flu is larger that would be required if I used PVC piping. I want to do this instead of running PVC pipe and cutting more holes in the side of my house and don't want to worry about snow drifts potentially blocking the combustion intake pipes.
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