I think Jerry sized it up.

I actually made a purposeful fraudulent statement to get the history of the vents. I forgot the history behind them.

Sorry about that. It made it a bit more interesting. I guess I could have been boring and just asked.

I will still stick to my statement that they should vent to the exterior when possible and it is a lazy way of doing things. They can stop functioning. Why take care of venting possibly twice. Just a good building/plumbing practise.

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Ted Menelly
"Castle"
Home Inspection Services