What is the minimum height for an atmospheric vacuum breaker installation?

The minimum height for an atmospheric vacuum breaker installation is 6 inches above the highest point of the downstream piping. This requirement is in place to ensure that the vacuum breaker can operate effectively and maintain a proper air gap, preventing any potential backflow of contaminated water into the potable water supply. This height requirement also provides sufficient distance to allow air to enter the system rapidly and prevent siphonage, which is critical for the safe and efficient operation of the device.

Understanding this standard is crucial for plumbing contractors, as failure to follow it can result in violations of plumbing codes and create health risks associated with backflow contamination.