Venting is an essential aspect of every plumbing system. Traditionally, the plumbing drain-waste-vent system consists of drain pipes for waste removal and vent pipes to prevent the escape of unwanted gases through the dry trap and maintain the required pressure balance to facilitate water flow. The drainage system in most homes directly vents through the roof with the help of a vent pipe connected to the drain pipe.

However, connecting various plumbing fixtures to the venting system during plumbing remodel is challenging and complex. Some structural elements in a building can make it tough to place additional vent pipes on the roofline. In such situations, plumbers use an effective venting option known as an air admittance valve.

What is an air admittance valve?

Air admittance valves (AAV), also referred to as durgo valves, present a viable alternative to venting a plumbing fixture when it is difficult or expensive to connect its drain to the existing vent network. They are simple, negative pressure-activated one-way mechanical devices installed to facilitate proper venting. They allow the pipes to drain correctly and prevent sewer gases from entering the living space by equalizing the air pressure in the pipes without connecting to the primary venting system.

Installation Guidelines for Air Admittance Valves

Detail the typical requirements and best practices for installing an air admittance valve. This section could cover aspects such as the necessary height above the fixture trap, placement considerations to ensure functionality, and any local building codes that might influence installation decisions.

Advantages of Using Air Admittance Valves

Discuss the benefits that make AAVs an attractive option in certain plumbing scenarios. These benefits might include reduced construction costs, ease of installation, and increased flexibility in plumbing design, particularly in complex or constrained building structures.

Limitations and Considerations

Highlight any limitations or considerations that users should keep in mind when opting for AAVs. This could include the life expectancy of the valves, maintenance requirements, and specific scenarios where traditional venting systems might still be preferable.

Real-life Applications of Air Admittance Valves

Incorporate examples or case studies where air admittance valves have been effectively implemented. This section can help illustrate the practical applications and problem-solving capabilities of AAVs in real-world scenarios.


Conclude your blog by summarizing the key points discussed throughout the article. Reinforce the importance of understanding the various venting options available to make informed decisions in plumbing projects, and encourage your readers to consider both traditional and innovative solutions based on their specific needs.

This structure should provide a comprehensive and engaging narrative flow for your readers, offering them valuable insights into the use and benefits of air admittance valves in plumbing.

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