James,

Thanks, I now feel about as smart as a rock!!

You would think I had never seen a vacuum system before.

The plumbing vents did have some long runs so I thought this was some bonehead's routing of a vent. This house was rural and there were plenty of bonehead issues in many areas that made it clear that it was never inspected by a building official.

Thanks for reminding me to use my common sense!!

Eric