great stuff thanks man,
that makes TOTAL sense, so just to add
ok, I cap off those vent pipes. but isnt that drain in itself also going to emit sewer gas ? and a lot more of it.
I guess when the engineer comes back, need to give him some hard and fast questions,
especially as the drain is being used act as an emergency affair in case of tank leak (which already happened and saved the basement) and the HVAC overflow tubes go into that as well
BUT I guess I'm a lot more knowledgeable about what is happening, thanks to all the great advice and digging around
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