I’ll chime in for all the plumbers from the bottom of this filthy hole I’m digging in someone’s foundation to say that our throat is basically a drain line to our stomach that doesn’t respect plumbing code, in that, it’s poorly attempting to stack-vent itself from the *same* opening as the drain which effectively means there no vent at all, or arguably, it’s attempting to wet-vent itself through the nose/sinus cavity which wrongly has a reduced diameter (capacity) when code would require, at minimum, one incremental increase in diameter to work effectively as a wet-vent.
It would fail an inspection with certainty.
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