All indirect waste piping requiring an airgap shall discharge into the drainage system through what minimum size airgap?

An indirect waste piping system requiring an airgap must discharge into the drainage system through a minimum size airgap of 1 inch. This size ensures that there is adequate separation between the waste and the potable water supply, preventing possible contamination. An airgap functions as a physical barrier that blocks backflow, ensuring that any potential pollutants cannot siphon back into the clean water supply.

The choice of a 1-inch airgap is based on established plumbing codes and safety standards designed to protect public health. Larger airgaps are also effective at preventing backflow, but the minimum requirement of 1 inch is sufficient for most applications, balancing safety with practical needs in plumbing design. This standard helps ensure that the drainage system operates effectively and safely, reflecting the importance of maintaining the integrity of the water supply system.