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?
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.