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I tried to explain to a homeowner the reason for a vent. It is to equalize pressure's, ventalaite the system and protect the trap from siphonange.
I gave an example of a 2 liter pop bottle. I said,"If you fill the pop bottle up with water and then tip it upside down to drain the bottle the water will just chug out and not drain properly, if you take that same bottle and fill it up again and let it drain and as it drain's poke a hole in the opposite side of opening watch the difference in how it drains." This would be an example of a drain creating negative and the vent equalizing that pressure. Would I be wrong in that particular explanation to a homeowner? Other's seem to think so. I don't know why.
I gave an example of a 2 liter pop bottle. I said,"If you fill the pop bottle up with water and then tip it upside down to drain the bottle the water will just chug out and not drain properly, if you take that same bottle and fill it up again and let it drain and as it drain's poke a hole in the opposite side of opening watch the difference in how it drains." This would be an example of a drain creating negative and the vent equalizing that pressure. Would I be wrong in that particular explanation to a homeowner? Other's seem to think so. I don't know why.