I sometimes meet them during home inspections, and I have no problem with them. When I find an air intake valve, I let my client know that it is not allowed in Minnesota. This will likely result in additional costs if someone has authorized plumbing in their home, and that`s the main reason I mention it. Air inlet valves are devices designed to solve a problem with the traditional open raw vent design and can serve as vents for drainage waste and ventilation systems instead of open raw vents. Our old homemade plumbing code explicitly prohibited the use of air intake valves (AVAs), but the new plumbing code, adopted in 2016, is silent on the subject, which means the same thing. AVAs are not allowed. If I remember correctly, there was some confusion about it in 2004 (?), and there was a loophole in the plumbing code that made them legal for maybe a month or two, but it didn`t last long. If you are reading this and know the exact details, please leave a comment. When installing these devices in your drainage system, remember that all air intake valves must undergo a test, which will be assisted by the sanitary inspector. If the Wisconsin Plumbing Code or other system approval provisions differ from the manufacturer`s instructions, the code and regulations should be followed. Bolt valves should be tested immediately before or after installation. The problem with air inlet valves is that they rest on a mechanical seal that can eventually fail. Still, some manufacturers, like Sioux Chief, offer a lifetime warranty on their air intake valves.

Studor offers a 10-year warranty and claims a lifespan of 500,000 cycles. In order to protect the joints from sanitary traps, the sanitary openings also allow the ventilation of pressurized wastewater gases to the outside. For this reason, at least full-size sanitary vents should always be installed in every house, whether air intake valves are installed or not. Air intake valves should not operate hygiene shock absorbers You could probably get confirmation or rejection by writing to the man mentioned in the AAV section of this bulletin: [www.commerce.state.wi.us] We just installed one on a Friday. The second option was to operate a 30` vent above a suspended ceiling under a slab. The entire ceiling should have been lowered by about 3 inches to accommodate the pipe. Links to The Wisconsin State Plumbing Code: [docs.legis.wisconsin.gov] **** I am not a plumber. Another problem with an air intake valve is that it could leak if there is a backflow of sewage.

This is a legitimate concern, so I tried to test a number of AVAs to see if I could scare them away. I installed a sink in my garage and clogged the drain and released the water. No leaks. I even turned the air vents upside down, and nothing leaked. Air inlet valves are mechanical devices that replace sanitary openings. They are inexpensive, they work, they can reduce the number of plumbing vents on the roof, they are not blocked by frost, they are listed and approved by several registration agencies, and they cost much less than plumbing. Currently, there are two manufacturers of air intake valves approved for use in Wisconsin; Oatey and Studor. The Studor Air Intake Valve (AAV) and associated system have been approved for use in Wisconsin effective January 1, 2001. Since the valve can affect the sizing and installation of the aeration system, S&B examined the valve and the Studor system with the “alternative system” verification process. It was on a bathtub drain. There is always a main battery, but in many newer homes they use studor valves for everything.

An AAV can replace conventional sanitary ventilation on individual fittings because it allows air to enter the drain without allowing sewer gases to enter the building. The following diagram, provided by Oatey, shows how air inlet valves can replace vents. It has been learned that Wisconsin`s air approval valves will become illegal after January 1, 2008 due to a number of issues that have occurred since the January 1, 2001 approval. Edited: Woops! 2008 – – – – – PlumbingSupply.com- Please visit our sponsor [www.PlumbingSupply.com] Edited 3 times. The Studor Air Intake Valve (AAV) and associated system have been approved for use in Wisconsin effective January 1, 2001. This information reminds us once again of Wisconsin`s new law, Bill 425, which states that any non-conductive side of water or sewer that is installed must include a location wire or other effective ways to mark the position on the side. These include sewers, private interceptors, water services and private water pipes connected to a municipal service. This law is effective. The city of Sun Prairie has had this for 1.

January 2007. We have shared this information with plumbers and excavators who have been in our area since July 2006. Author: Reuben Saltzman, Structure Tech Home Inspections Reuben Saltzman is a second generation building inspector passionate about his work. Of course, this blog is about home inspections and domestic issues in the Twin Cities metropolitan area. In addition to his work at Structure Tech, he is also a certified truth appraiser selling homes in Minneapolis, Saint Paul and several other cities. 1908? Wow, what a retroactive law! I didn`t know they had any at the time. waukeshaplumbing, I`m with you about it (although an unpopular opinion here). Studors have their stakes limited. I just don`t see an island sling vent better than a studor, especially on kitchen sinks with eliminations. Kitchen drains are one of the most sensitive to backups and anything that goes into loop ventilation. My point is that I bet the failure rate of a loop vent is higher than that of a studor.

I just called Local 75 plumbers at WI and was told that it is not forbidden in 1-1-08. it`s something that happens and will probably be limited, not canceled. He was the best business agent and he is the one who would know it. he hates studors. it costs him money. Every extra hour needed is a different man on the ground and another dollar in union dues. This thin rubber membrane will deteriorate with age. I think that`s why they were banners for a while until 2001. I think the rubber has improved. I`ve used about 20 studors over the years and I`ve only had one recall for one that went wrong after about 8 years – there was a stop in the sink line – this will result in a studer failing when the air retreats to evacuate and “burst” the membrane. I installed about 10 of them and almost every one of them had a problem. – – – – – PLUMBERS “Protection of national health” STUDOR AVAs must be accessible in case of replacement.

For wall mounting, use the STUDOR recessed box / grid combination. The location of the STUDOR AVAs must be sufficient for sufficient air to enter the valve. If you are in a wall or attic without ventilation openings, an opening should be provided. We need a spreadsheet for the calculation of water, which is supplied with all family apartments 1 and 2 and also with all commercial projects up to 15 sanitary fittings.