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Trent , Alison – When using AAV – we need at least one vent from the plumbing system to push through the roof. STUDOR AAVs installed in attic area must be located a minimum of six (6”) inches above the ceiling insulation. The vent shall connect to the drain vertically to maintain an unobstructed opening in the piping to the STUDOR AAVs. Some state and local building departments prohibit AAVs.
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Why are Air Admittance Valves Necessary?
AAVs can greatly reduce the number of venting materials in a plumbing system and are generally maintenance-free. A lot of times when you have a drain which has a slow vent it will siphon or suck the liquid out of the trap of one or more of your other sinks or basins. This can in turn give you a odor coming up from the sewer. We are an emergency services business for urgent plumbing, drain cleaning, drain clearing, water damage, and related excavation issues. When you need a job done immediately, call the plumber whose name is his number. This diagram explains exactly how an air admittance valve works.

Air Admittance Valves — also called cheater valves, mechanical vents, and even durgo valves — are mechanical devices that provide you with a one-way venting system. They allow air to enter your drain as the water disappears. No vent shall terminate in an attic unless it is well ventilated and/or is working independently of the house .
What is an Air Admittance Valve?
That’s money in the pocket for the plumber. They also allow greater flexibility in the layout of plumbing fixtures, and reduce long-term roof maintenance. If we don’t have a hole in the roof, it’s easier to maintain the roof. AAVs have been effectively used in Europe for more than two decades.

A Dynamic Favorites List is automatically created from your purchase history based on the timeframe, ship-to name, and product categories you want included. This list updates each time you open it based on the criteria selected. If you add an AAV leave access to maintain the vent. It’s mechanical – and all mechanical parts eventually wear out…and Yes, check with your local code office – some jurisdictions won’t allow an AAV. During maintenance you’ll want to be assured the top of the vent is kept open.
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Such open air vent is recommended, not required, to be located as close as possible to the connection between the building drain and building sewer. An Air Admittance Valve is a 1-way valve designed to allow air to enter the plumbing drainage system when negative pressures develop in the piping system. The device shall close by gravity and seal the vent terminal at zero differential pressure and under positive internal pressures.
The temperature ranges that the Sure-Vent will operate in are -40°F to 150°F, your attic can experience drastic temperature variations depending on how it is vented and your geographic location. Insulation fibers can get caught inside the diaphragm which will make it harder for the diaphragm to open, or achieve a good seal when it is in the closed position. The Sure-Vent should be installed a minimum of six inches above the finished height of your insulation, and the attic must have an access point to conduct scheduled maintenance. Seven hours away and at a disadvantage in not being able to be on site and look closely ourselves. We really liked the house and were anxious to close, however Gary's eagle eye pointed out several significant issues that gave us pause. He was very professional in his reporting and tried to lay out the facts as he saw them in plain english.
If you are currently using Internet Explorer we recommend you switch to Edge or another supported browser to enjoy the best experience Oatey.com has to offer. The Sure-Vents are not designed for exposure to Ultra Violet Rays. Oatey® offers a wide range of Sure-Vent® Air Admittance Valves to enable installation in virtually any application.

Reading the many reviews about how AAVs are suppose to last much longer than 4 years, I assume there must be something else going on with the plumbing in our home. We would appreciate if you could share any other tips for solving this mystery, other than replacing AAVs. Had a sink that started no-slow draining, I though some one must have poured thick grease or white glue down the sink. After $40 for drain opener, special plunger, and snake, no joy after two days. I opened the shop cabinet and eureka found a AAV, took it drained perfect, I could not believe it. Im not a plumber but a refrigeration tech, we do the plumbing as it relates to our fixtures.
The active air valve is designed with an exclusive vermin protection system to keep out insects and foreign objects. The total amount of the cross-sectional area of vents combined on the system has to equal the aggregate cross-sectional area of the building drain. When properly installed an air admittance valve in the system is equivalent to an open vent pipe having the same cross sectional area as any other vent.

The very essence of a vent is to prevent siphon and vacuum forces in building up in the system, it is also to provide an exit for the gases produced in the system. The AAV’s only function is to avoid costly installation of complicated vent system for isolated/difficult fixtures. Unless you want sewer gases entering your home when your plumbing is under positive pressure, you’ll want a venting system. And AAVs are mechanical devices that can accomplish the task easily. Magic Vent prevents siphonage without the need for additional piping outdoors. It also performs the function of a DWV system vent stack, protecting the trap seal from siphonage without the need for additional piping to the outdoors.
I would like to know the answer to Trent Spivey’s question — is there a new plumbing code that allows for all plumbing vents to terminate in the attic with aav devices installed. When a horizontal branch connects to a stack more than four branch intervals from the top of the stack. The relief vent must be located between the connection of the branch to the stack and the first fixture connecting to the branch. The relief vent may also serve as a vent for the fixture. Likewise, they equalize the air pressure in your pipe, which allows them to drain properly and prevent those sewer gases from getting into your living space.
AAVs work with the help of a rubber sealing mechanism that is lifted to let air into the drain system. Positive pressure causes the mechanism to close so that gases cannot escape into the home. And if was a 4 year old, excellently built structure. This speaks to Gary's thoroughness of every home inspection, regardless of its age. I love the detailed report he provides. Additionally, he embeds videos to illustrate specific areas and a summary video for the entire inspection.
Sometimes structural blockages or multi-stories won’t allow a vent to be placed on the roofline. In those cases, air admittance valves are another option to consider. Help prevent sewer gas from entering your home while you vent your drain line with the Oatey 1-1/2 in.

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