The key is to get them as high up as possible but still be able to access them to change them out if necessary. Ideally they would be above the flood level, but that is not always possible.Sorry frodo but it doesn't say that.
It says, "Individual and branch-type air admittance valves shall be located a minimum of 4 inches (102 mm) above the horizontal branch drain or fixture drain being vented.
You may have been looking at Stack-type AAV's.
AAV's are located below sinks all the time.
There are no S-traps in a new house. Or at least, shouldn't be.I understand from your statement "Even with a p-trap, by dropping down without a vent, is in itself creating an S-trap."
Since my house is 80 years old, do I need to update every sink trap to have an AAV?
Also, are you implying that every new house construction with an s-trap has an AAV beneath each sink.
Thanks,
Bruce
My house is 80 years and has its share of not up to current code issues (outlets with no grounds, S-traps)....from what I read online...home inspectors look explicitly for S-traps.
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