blazenut Posted January 6, 2010 Report Share Posted January 6, 2010 I was at a home today that had a high efficiency furnace with pvc intake and exhaust (see pics below). As you can see they joined in the attic before a single pipe exited the home. Why would one do this? I would think that this would re-use the exhaust as intake-no? I havent seen this before. Thoughts would be appreciated. Click to Enlarge 47.96 KB Click to Enlarge 25.63 KB Click to Enlarge 44.86 KB Click to Enlarge 30.33 KB Link to comment Share on other sites More sharing options...
Robert Jones Posted January 6, 2010 Report Share Posted January 6, 2010 What brand is the furnace? I have never seen that exhaust setup before and doesn't seem right to me for the reason you listed above. Link to comment Share on other sites More sharing options...
Brandon Whitmore Posted January 6, 2010 Report Share Posted January 6, 2010 Google: Concentric vent termination kit. The only reason I can think of why this is better than running 2 separate pipes would be to have only one penetration instead of two. PS: That kit is over $100.00-- someone's making a killing. Make sure the exhaust is connected to the inner part of the pipe. Link to comment Share on other sites More sharing options...
blazenut Posted January 6, 2010 Author Report Share Posted January 6, 2010 It was a Payne, 10 years old. Link to comment Share on other sites More sharing options...
Bill Kibbel Posted January 6, 2010 Report Share Posted January 6, 2010 If you're not familiar with concentric vent systems, you should read the installation instructions to be sure it's installed and terminated correctly. I have an old set that I can send you if you don't have it available. Link to comment Share on other sites More sharing options...
blazenut Posted January 6, 2010 Author Report Share Posted January 6, 2010 Thanks alot guys. It is still interesting to me that this would be allowed knowing that the intake and exhaust locations are so close to each other... Link to comment Share on other sites More sharing options...
Brandon Whitmore Posted January 6, 2010 Report Share Posted January 6, 2010 Here's one set of instructions: http://www.luxaire.com/PDFFiles/66641-U ... 87-000.pdf Link to comment Share on other sites More sharing options...
Robert Jones Posted January 6, 2010 Report Share Posted January 6, 2010 Thanks Brandon. Link to comment Share on other sites More sharing options...
hausdok Posted January 7, 2010 Report Share Posted January 7, 2010 Hi, I've seen them a lot in a couple of developments that I've been doing a lot of houses in. It's a category IV - they don't care if a little CO2 mixes with the intake on those because they're sealed away from the interior. Besides they're usually sucking in so much extra air that the amount of CO2 is negligible. ONE TEAM - ONE FIGHT!!! Mike Link to comment Share on other sites More sharing options...
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