I'm not an HVAC guy but you can use PVC pipe in this situation??? That doesn't seem right.
this post was submitted on 13 Aug 2023
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It's a high efficiency system. That's what they call for. Instead of venting into the chimney they go directly outside, one is for intake of fresh air and the other is for exhaust.
Nice work! Is there a reason for not connecting the exhaust back to the chimney like before?
The new one is a high efficiency unit. So you don't exhaust those through a chimney with duct, because they aren't that hot, and they need an intake.