Doing a renovation to my side porch and I noticed this additional pipe off my main vent (bottom right).
I believe at some point the previous owner had their washer and dryer up here; you can see the vent hole for the dryer in the lower center of the image.
From right to left (hard to see because you took the picture to far to the left) looks like a vent with a clean out and an old drain for the washer (that's to low).
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