What is an air admittance valve?
What is an air admittance valve?
Studor Air Admittance Valves (AAVs) are negative pressure-activated, one-way vents, used in a drainage system to eliminate the need for passive pipe venting and unsightly, costly roof penetrations. A valve for single fixture and group venting. A valve for stack venting, eliminating the need for a vent pipe through the roof.
What is an active vent pipe system?
This is to release a vacuum and allow air to enter the plumbing vent pipe, thus balancing the pressure into the system so the drainage can function correctly. The Studor vent piping system is commonly known as an active system, rather than a conventional ‘passive’ vent pipe system, because the AAV opens when there is a need.
What type of venting valve do I Need?
A valve for single fixture and group venting. A valve for stack venting, eliminating the need for a vent pipe through the roof. A valve for where flame retardance is a priority, equally suitable for residential use.
What are the benefits of AAVs in plumbing?
Using AAVs significantly reduces the amount of materials needed in a plumbing system, increasing plumbing labour efficiency, allowing greater flexibility in the layout of plumbing architecture, and reducing long-term roof maintenance problems associated with conventional vent stack roofing penetrations.
An air admittance valve is a small mechanical device that helps provide airflow for trap seals, without the need for additional stack vent piping out the roof. If an AAV is an acceptable option, they can prevent the need to cut holes in walls, ceilings, attics, and roofs, thus saving much time and labor expense.
What size admittance valve do I need for my ventilation system?
Air admittance valves are suitable for both primary and secondary ventilation. Typically, they are designed to fit 110 mm or 82 mm pipe for stack ventilation.
Where should an air admittance valve be placed in a trap?
The air admittance valve should be placed in an area that allows good physical access as well as free air flow. They are often fitted to the drain line, between the trap and the wall, generally at least 4 to 6 inches above the weer, which is the highest part of the trap where it turns lateral.
Can AAVs be used in place of vents?
Depending on the valve and the size of the vent, AAVs can support one or multiple vent lines. However, before you begin installing an air admittance valve, check with your local building inspections office as local codes govern the use of AAVs in place of vents. Before you install one, it’s important to understand how AAVs work.
