greyboy39 Posted April 9, 2014 Report Share Posted April 9, 2014 Click to Enlarge 38.28 KB Hello I ran into this today and have not seen this type of installation before. The exhaust flue and intake pipe appear to be sharing the same pipe and join together right before they meet the exterior wall. Typically I see the two pipes exiting the wall separately. Is there any case where this is allowed. To me it simply seems that the exhaust gases are being recycled back into the furnace for the combustion air. It is a carrier weathermaker 60000 btu furnace model 58MVP060-14. Thanks. Link to comment Share on other sites More sharing options...
Chad Fabry Posted April 9, 2014 Report Share Posted April 9, 2014 The pipe that goes through the wall is coaxial. It's a pipe inside a pipe. Link to comment Share on other sites More sharing options...
Bill Kibbel Posted April 9, 2014 Report Share Posted April 9, 2014 ...and it's called a concentric vent termination. Before assembly: Click to Enlarge 4.06 KB Link to comment Share on other sites More sharing options...
rkenney Posted April 10, 2014 Report Share Posted April 10, 2014 You'll see this on the outside wall. Click to Enlarge 26.57 KB Link to comment Share on other sites More sharing options...
Mike Lamb Posted April 10, 2014 Report Share Posted April 10, 2014 Or this. Click to Enlarge 69.65 KB Link to comment Share on other sites More sharing options...
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