I'm trying to make assumptions on the purposes of the vents in my home and I understand that it may not be correct without opening up walls. It would be a great help for me in knowing how my home operates and if there is adequate venting. There are one bathroom and dryer per floor. 1st and 2nd floors have their own kitchen. Gas furnace is located in the basement. Based on common practices, are these assumptions correct? Thank you in advanceenter image description here

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    Do you have a central vac? That could be the what is this? If not, then what is nearby on the inside right where that one is? – Tyson Jan 19 '18 at 19:13
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    The sewer gas vent you have marked, looks like a furnace stack to me. The part where you ask what is this, Where is that located? The basement? It looks like a a sump drain of some sort. It could be an inlet for a fresh air for the furnace. Hard to say without more information. – eaglei22 Jan 19 '18 at 19:21
  • I do have a central vacuum system just about right there where the round pipe is. I will go home and investigate. Thank you! – Gloria Jan 19 '18 at 19:29
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    Voting to close. This is one of those "need to be onsite" questions and has been abandoned by its author. – isherwood Jul 20 '18 at 14:29
  • I also think it is two broad, when folks don't return these old questions keep coming up and unless there is a really good answer they need to be purged.+ – Ed Beal Oct 30 '18 at 19:43

You need to turn the fans, the furnace, the vacuum one at a time, take a ladder around and see where you get some action. Your assumptions don't really work.

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