Venting in Attic

Inspected a town house today and noticed two plumbing stacks venting in the attic. I could see one of the condensate lines tied into one of them. Shouldn’t they be through the roof? There seemed to be plenty of stacks going through the roof. Am I missing something?


Good catch all vents need to go out side by them selves .

Thank you. I was surprised to see them. The town home was nearly flawless, just making sure I wasn’t missing some kind of town home exception etc…

Although… :wink:

Not allowed here.

May be where the OP is located… :roll:

Is it possibly the intake for a high efficient furnace? I have seen where they will pull from the attic if there has been problems with the intake icing over or getting blocked by snow.