What is a under the counter air vent ? How is it installed ? What is the use of this item ?
What is a under the counter air vent ? How is it installed ? What is the use of this item ?
Are you asking about an air admittance valve (AAV) ? If so, install on the horizontal lateral line between the wall and the trap. An AAV is not going to work for decades so it must be accessible. All fixture need a trap and traps need a vent to allow air to enter the system otherwise water would not drain properly. To see how water drains without a trap turn a pop bottle upside down and watch how it chugs
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