What is the maximum weir height from a fixture outlet to a trap?

In plumbing, the maximum weir height refers to the vertical distance from the fixture outlet to the trap's inlet. It is crucial to maintain this height to ensure proper drainage and prevent potential siphoning or backflow issues.

The correct choice indicates that the maximum weir height is 24 inches. This is established in plumbing codes to ensure that there is enough gravitational pull on the waste being discharged from the fixture while preventing any undue pressure that could lead to drainage problems.

When the weir height exceeds this limit, it can cause issues such as traps not functioning correctly or creating conditions that allow sewer gases to escape. Therefore, maintaining the height at or below 24 inches is vital for proper plumbing function.

The other options fall outside this code requirement; heights above 24 inches would not be compliant with plumbing standards and could lead to inefficiencies in wastewater management. Understanding these specifications is essential for designing and installing plumbing systems that function effectively and meet regulatory requirements.