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We're working on a house with cathedral ceilings and a metal roof that we do not want to penetrate with vents. California Plumbing Code applies which is based on the UPC. We would prefer air admittance valves (AAV) for secondary fixtures, but they are not allowed. Contrary to our inspector's...

Along U-turn of 180 deg as in the diagram would require another clean-out.

In my view, a horizontal vent cannot be connected to a drain line as per the example to the left, but must be vertical -- any angle 45 and above. As to the connection point on the drain line, it should be downstream as soon as the drain has made it's turn, see drawing to right. This also...