View Full Version : Under the counter drain vent
b44m16c10
Jun 27, 2009, 08:20 AM
What is a under the counter air vent ? How is it installed ? What is the use of this item ?
ballengerb1
Jun 27, 2009, 08:39 AM
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
b44m16c10
Jun 27, 2009, 08:48 AM
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
Thank you for your answer on this matter it will be put to good use THANKS
speedball1
Jun 27, 2009, 11:58 AM
What is a under the counter air vent ? How is it installed ? What is the use of this item ?
A under the counter air vent or AAV/ Air admittance Vent(see image) takes the place of a regular vent through the roof. It's mounted just downstream from the trap. Do you need more information? Regards, tom