Rhode Island Journeyman Plumber Practice Exam

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What is the minimum distance for an air gap?

12 inches
18 inches
24 inches
30 inches

The correct answer is: 24 inches

An air gap is a crucial component in plumbing designed to prevent backflow and contamination of potable water. The correct minimum distance for an air gap is indeed specified as 24 inches. This distance ensures that any potential water that might come back through the system does not contaminate the clean water supply. The rationale behind this specific measurement is based on safety standards and plumbing codes which are established to protect public health. A 24-inch separation provides a sufficient barrier to prevent backflow, recognizing that water can be propelled back into a system due to pressure changes, siphoning, or other factors. The greater the distance of the air gap, the safer the system is against contamination. In practical application, this means that the discharge point of a waste line must be at least 24 inches above the flood level of the receiving fixture to be considered compliant.