Backflow Prevention Practice Exam

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Technically, the air-gap separation dimension is determined from the ____?

Discharge pipe's outer diameter
Effective opening
Fixture inlet diameter
Supply pipe diameter

The correct answer is: Effective opening

The air-gap separation dimension is determined from the effective opening because it is essentially the minimum vertical distance required between the outlet of a fixture or discharge pipe and the water level in the receiving vessel or receptacle. The effective opening refers to the actual cross-sectional area through which water can flow, and it plays a crucial role in establishing the proper air gap to prevent backflow. By calculating the air gap based on the effective opening, one ensures that there is sufficient space to prevent any potential contamination of the potable water supply. The effectiveness of the air gap as a backflow prevention method is directly linked to this dimension, as it needs to be designed to adequately separate the discharge from the potential backflow hazard present in the receiving container or system. Other dimensions related to the structure of pipes or fixtures may provide some context, but the effective opening specifically focuses on the flow area that affects the potential for backflow, making it the correct reference point for determining air-gap separation.