Where should an atmospheric vacuum breaker be installed?

An atmospheric vacuum breaker is designed to prevent backflow in plumbing systems and protect potable water supplies from contamination. The installation of an atmospheric vacuum breaker must adhere to specific height requirements to function effectively.

When installed at least 6 inches above the highest point of a nonpotable system, the atmospheric vacuum breaker ensures that any potential backflow cannot reach the drinking water supply due to the pressure changes that can occur in the plumbing system. This height creates a physical barrier, allowing air to enter the system and break the vacuum, thereby preventing any siphoning action that could lead to contamination.

Proper installation height is crucial for its effectiveness. If it's installed too low, it may not prevent back-siphonage, thus exposing the potable supply to contaminants. Therefore, ensuring that it meets the minimum height requirement is vital for maintaining safe drinking water standards.