Originally posted by jnaas2
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A through the roof vent is the best way.
I just used that drawing I had on file to show the way a vent should come off the line without creating a s-trap.
As far as the trap to the vent using a wye instead of a sani tee would also create a s-trap...

Note the airflow back along the top of the horizontal arm and how it is lost with the use of a wye and 45 or, combo.
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