[Latitude 28]

Much like a header system with the "Y" joint in play and once the vertical exhaust pipe and generator exhaust system is hot and creating a draft I would think there would be no back flow into the AH system. That would all depend on several variable conditions i.e. which way the wind is blowing, atmosphere conditions and/or weather. I think we did actually have some exhaust fumes from the generator back up into the AH exhaust escaping through the rusted areas of the pipe. For whatever reason we could smell fumes from either unit when run independently of each other. Once I can get the coach out of the garage I will check it out to see if the AH exhaust pipe fixed the situation or not....may have some generator exhaust work to do as well.....talking about a sore neck/back!