What is the minimum height of a vacuum bracket above the flood level rim of a fixture?

The minimum height of a vacuum bracket above the flood level rim of a fixture must be at least 6 inches to ensure proper function and safety in plumbing systems. This requirement helps prevent backflow or siphoning that could contaminate the water supply.

Having the vacuum bracket positioned 6 inches above the flood level rim creates a physical barrier that minimizes the risk of any waste or contaminated water being drawn back into the clean water supply. This is critical in maintaining the integrity of the plumbing system and protecting public health. The Massachusetts Plumbing Code stipulates this height based on best practices and historical data regarding plumbing failures and safety incidents.

Choosing a height less than 6 inches would not provide sufficient protection, thus increasing the risk of backflow contamination. Similarly, while a height greater than 6 inches may be permissible in certain contexts, it is not the minimum requirement. The code is designed to enforce consistent standards that protect both plumbing infrastructure and occupants' health and safety.