Darren Posted March 25, 2009 Report Share Posted March 25, 2009 Built in 1993, 2 fan assisted furnaces along with a water heater are venting into a exterior chimney. Corrosion and staining indicates a problem. Someone figured the gases were condensing before exiting and came up with this (there's another one on the 2nd furnace). Click to Enlarge 45.66 KB Quote Link to comment Share on other sites More sharing options...
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