Access should be provided to what type of valves?

Access should be provided to all air-admittance valves because these valves play a critical role in plumbing systems. They are designed to allow air into the drainage system to prevent negative pressure and facilitate proper drainage. Having access to these valves ensures that they can be inspected, maintained, and replaced if necessary to ensure the system functions correctly.

Air-admittance valves can become blocked or malfunction, leading to drainage issues such as siphoning or backup. Therefore, it is essential for any maintenance personnel or plumbing professionals to have the ability to reach these valves for routine checks or emergencies. Access to these valves also contributes to overall safety and functionality within the plumbing infrastructure of a building. Many plumbing codes and best practices require that air-admittance valves be installed in accessible locations, reinforcing the need for this type of access. Providing this access aligns with good design principles and compliance with regulations in the plumbing industry.