I’m helping my son with a remodel. We’ve got a laundry room on one side and bathroom on the other. Pictured is 2” drain/vent pipe for the washer. Vanity (on the far wall) vent will connect above from a horizontal vent. Bathtub and toilet will be on the other side of this stud wall. Can we vent all of these through one 2” vent through the roof? Or will I need larger vent pipe or a second vent?