Legal Support. BPF Branding. Communication Tools. Influence UK Policy. Your Company Page. Related Categories Latest News. Positive pressure with an AAV often occurs when there is a stoppage problem elsewhere in the system.
Without proper diagnosis, you will try to get the sink flowing by snaking its drain, when the real problem is elsewhere. This can lead to immense frustration after you snake it a dozen times and it still doesn't drain. Then you come here and ask why your snake is not working. This would be a common problem with a flooded septic system, which would not create a problem anywhere else in the house where there is a regular vent. Last edited: Aug 7, I wonder if the people that giving glowing reviews of the studder vents are plumbers that went through 4 to 5 years of training and 4 years of schooling.
As well as taking 4 hours of continued education classes. Also if they have any field experience. They do not work properly all the time, it is a hack way of doing plumbing. Why do you think half of the states do not allow them. Why do you think that the other half of the states that do allow them over half of them you have to get approval to use them from the building department. SewerRatz , Aug 7, For less then the cost of a fitting or two, they could have hard vented, and then we wouldn't have dealt with the smell from that bathroom, until we realized it was a bad AAV.
You don't have maintenance issues like that with proper venting. Any mechanical device made with rubber will fail. They need to be accessible and with proper ventilation. The valve only works with pressure in one direction. Plumbing provides pressure in two directions. If there is not other way, I can see it, But when you have the option during rough-in of hard venting, then hard piping is the way to go.
Terry , Aug 7, Joined: Jul 30, Occupation: Tech. Instructor Location: S. I hope you did not cause a trap any where in the venting system as it willl defeat the whole purpose of the vent I have not looked at any drawings but your statment "It was actually a lot of fun running all the turns to get it up around the pass-through window!
Gave me pause to think you may have Incorrect pitch can trap it also Last edited: Aug 15, I called it out because it went from the motor to the pipe and then hung loose just past the picture. That was the issue. It was not connected to a continuous ground. Some one started right, but never connected it. Currently there are two manufacturers of air admittance valves that are approved for use in Wisconsin; Oatey and Studor.
Air admittance valves everywhere I have been running into more of these on new construction. Is it less than 20" below the flood rim of the tub? Studor air admittance valve linked to alternate system approval The Studor air admittance valve AAV and accompanying system has been approved for use in Wisconsin, effective January 1, Studor valves must be tested immediately prior to or after installation.
Positive Air Pressure Attenuator. Operation is simple: when a fixture drains and creates negative air pressure in the correlated drain line, the valve is opened, drawing air back into the pipe. Once the air pressure has been equalized, the valve securely closes preventing the escape of gas until the pressure drops again.
AAVs can be used to service an individual fixture or several - what's permitted depends on local code, and the model being used - units like the Redi-Vent can accommodate a mere 20 DFUs Drainage Fixture Units while large units like the Maxi-Vent can handle up to DFUs.
AAVs are most often found under sinks especially island sinks and in basement bars or bathrooms. Installation guidelines can vary depending on code, but in general AAVs serving a single fixture should be at least 4" above the center of the trap arm.
When serving multiple fixtures, they should be a minimum of 6" above the flood level rim of the highest fixture, and should only vent fixtures that are on the same floor level. Because they rely upon gravity to close, AAVs must be installed in a vertical position. In any dwelling, there must be at least one vent open to the atmosphere outside per code.
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