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I think I'm picking up what your putting down. I understand the horizontal. But when you speak of vertical are you referring to the vertical rise of that horizontal pipe. This horizontal vent is say 30'. Is the vertical the distance this pipe goes from its beginning to where it ties into main...

I guess I'm confused on what you mean by horizontal and vertical. Thx for taking this time to help.

If the horizontal run is 1/3 the vertical rise. Is that what you mean?

1 shower, 2 sinks, 1 whirlpool tub and 1 toilet. Can all these vents connect in the attic and return to the main 3" vent stack? Distance they must travel in attic is 25' approx.