I'm sure this thread will go the distance in discussion.
As a plumber and drain cleaner, I find myself taking issue with building any piping system that I know I've encountered over time that proved to be horrible from the standpoint of cleaning the drain.
Hi, I'm installing an all new DWV system in a remodel. An inspector said that a 3" drain on a toilet requires a dedicated 3" vent. If I have a dedicated vent, doesn't the size seem excessive? I had in my memory that the vent for a dedicated water closet drain needs only be 1 1/2"