wow a true pissing contest between a sparky (electrician) and plumber. Yes the roof vent. Im not a smell scientist, but 100% of time, the inlet baffle is missing, we replace it, smell gone. As I said, it slows the movement of gas through the pipes. The breaking down of sewage creates gas.
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I'm baffled....... Sewer gas smell through a roof vent is part of (reason) the roof vent being on the roof. There's always sewer gas escaping through a vent. It sounds like less sewer gas with an inlet baffle tee?