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HE furnace intake and exhaust question


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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.

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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.



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