What is another name for a Studor vent?

Author: Mr. Santiago Heathcote MD  |  Last update: Thursday, July 10, 2025

An Air Admittance Valve (AAV), which you may also hear referred to as a Studor Vent, Studor AAV or Mini Vent, is a one-way mechanical valve that is installed locally at the site of a plumbing fixture, allowing proper venting to occur without a connection to a larger venting system and stack vent.

Why is Studor vent illegal?

The Studor vent lets that air to be sucked in the pipe during water flow but doesn't let sewer gas escape out. Code is the thing that determines pipe size and also water flow. Hence no studor vents are permitted to toilets because more air is required to keep water flow going with more waste added to the toilet.

What is another name for the B vent?

B-Vent, also known as Type B vent or natural draft vent, is commonly used for venting gas appliances that are designed to use indoor air for combustion. These appliances typically have a draft hood to facilitate the flow of air and exhaust gases.

What is the difference between an air admittance valve and an inline vent?

Automatic air vents are spring type devices often referred to as in-line or cheater vents, while air admittance valves have no spring. Air admittance valves are more expensive and are approved in many jurisdictions where in-line and cheater vents are not because of their moving parts (springs).

What is the downside of the air admittance valve?

The other potential problem with using an AAV instead of a vent pipe is that if you ever get a blockage in the system that prevents the gasses from being pushed down into the sewer, those gases will have nowhere else to go.

Air admittance valves for plumbing venting explained, [just over 4 minutes]

What is the life expectancy of an air admittance valve?

Air admittance valves have a typical life expectancy of 20-30 years, so if you start to have issues with sewer gases or smells being released around your sink or in the attic-wherever installed- the air admittance valve could be faulty or failed and should be replaced as soon as possible.

How to tell if studor vent is bad?

Signs of that the Sure-Vent is not operating as intended, are foul odors. If you smell foul odors (sewer smell) near a plumbing fixture which has a Sure-Vent installed, this means the Sure-Vent is not closing properly to create a positive seal and should be replaced.

What is another name for the air admittance valve?

An Air Admittance Valve (AAV), which you may also hear referred to as a Studor Vent, Studor AAV or Mini Vent, is a one-way mechanical valve that is installed locally at the site of a plumbing fixture, allowing proper venting to occur without a connection to a larger venting system and stack vent.

Are studor vents reliable?

AAVs are certified to reliably. However, anything mechanical can and will fail.

Where are air admittance valves not allowed?

Air admittance valves are not permitted in spaces where pressure conditions adversely affect the valve's operation. They are also not allowed in concealed wall and ceiling spaces used as plenums as part of an air distribution system that is under negative or positive pressure.

Can I use my existing venting for a tankless water heater?

Can You Use the Existing Vent for the Tankless Water Heater? It is not recommended that you use the existing vent pipe from an old gas tank water heater. The existing vent for tankless water heaters may not be compatible because most are galvanized vent piping and will rust quickly.

Which Type B vents shall not be used for venting?

Type B Vent shall not be used to vent flue products from incinerators, combination gas/ oil appliances, oil-fired, or wood-burning appliances. If there is a question about the use of Type B Vents, contact the appliance manufacturer or DuraVent's Engineering Department for further information. 1. Appliances.

What is the most realistic gas fireplace?

Finally, the B-Vent fireplace has the most realistic-looking flames of all the gas fireplace options. This is currently the least popular style of fireplaces, but that doesn't mean it may not be right for your home!

Does a Studor vent let air in or out?

The Studor Air Admittance Valve (AAV) is a one-way valve that allows air to enter the plumbing drainage system when fixtures discharge. The valve closes by gravity when discharge is completed and under no flow conditions preventing sewer gas from escaping into the valve.

What is a Studor mini-vent used for?

With its compact design, the Studor Mini-Vent Air Admittance Valve with PVC Adapter offers a simple drain and waste venting solution. Great for venting a single fixture or a group of bathroom fixtures, the Mini-Vent air admittance valve is designed to fit 1-1/2- and 2-inch pipes and excels in tight applications.

Where do you install a Studor vent?

The Studor valve must be installed a minimum of 4" above the horizontal branch the horizontal branch drain or fixture drain being vented. Studor AAVs must be installed within 15 degrees of the vertical position. Studor valves can be installed below the flood rim level of the fixture.

How high does a Studor vent need to be?

It must be located a minimum of 4” above the horizontal branch drain, 6” above any insulation material and within 15 degrees of vertical.

What can go wrong with an air admittance valve?

Potential issues with air admittance valves

Sometimes unwanted smells may be emitted, gargling sounds may occur or wastewater comes up from the soil pipes into the sink. All of which are signs that there may be an issue with the air admittance valve.

Can you bury a Studor vent in the wall?

Each AAV has to be accessible and have unimpeded airflow, so it can't be sealed inside a wall.

What is another name for the isolation valve?

A diaphragm isolation valve—also known as a "membrane valve"—is a solenoid-operated device that uses a diaphragm that extends and retracts to seal the valve seat and isolate the flow path.

Who invented the studor vent?

Sture Ericson developed the air admittance valve (AAV) in Sweden in the early 1970s. He introduced the valve to the United States in 1986 and was instrumental in the development of the ASSE Performance Standards 1050 and 1051, as well as gaining code approvals in state and model codes. In 1988, Studor, Inc.

How to test a studor vent?

How do I know if the AAV is working? The most accurate way to test an AAV is by using a manometer. However this may not be readily available. Another way is performing a field test in a cup of water, Place the air admittance valve (AAV) in a cup as shown here, on page 4.

Can a plumbing vent get clogged?

The plumbing vent allows air into the system to overcome the vacuum and force the water through the pipes. It also allows any sewer gases left behind in the pipes to flow out of the building. This vent pipe is usually located on the roof, which means it can easily become clogged with dirt and debris.

What is the warranty on Studor vents?

The Mini-Vent should be connected to the piping in accordance with Studor's installation instructions. Refer to your local area regulations for open vent requirements. The Studor products have a 10 year warranty period.

Do air admittance valves wear out?

Remember that these valves should last anywhere from 20 to 30 years, so if they are only lasting for a couple of years, there may be some problems that need addressing.

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