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The flue run is about 15' to the side of the house. It's a no fan direct vent, sloping downwards with the final outlet much lower than the boiler. I bought the house like this. There is a capped stack for the old conventional furnace in that room, but earlier this year when I had the roof done I had them shaved the old stack.
I have the same unit in my garage, that exhaust is about 30 ft in length also exiting lower than the boiler. I haven't taken any good pics of the whole room.
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