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Furnace To Fresh Air Adder Vapors Photo 2
This is another view of fumes passing from furnace exhaust to fresh air adder as describe in
 photo and video linked at FurnaceToFreshAirAdder.htm
However you can also see the Water Heater Exhaust Stack at upper right
 which is also close to and easily adds its fume to the Fresh Air Adder lower left
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