What should be the ideal air gap size for compliance with plumbing codes?

The ideal air gap size for compliance with plumbing codes is typically 1 1/2 inches, as this distance ensures that there is an adequate physical separation between potable water and non-potable water, thereby preventing contamination. The air gap acts as a safeguard against backflow, allowing any potential back-siphonage to take place without risking the quality of the drinking water supply.

This size is generally accepted in plumbing codes, aligning with standards set by organizations such as the International Plumbing Code (IPC) and Uniform Plumbing Code (UPC). By adhering to this measurement, systems can effectively prevent any backflow incidents that could lead to serious health risks associated with waterborne diseases. Ensuring the proper air gap is crucial in the design and installation of plumbing systems, particularly in areas like kitchens and industrial settings where cross-connections may occur.