How should an ice maker storage chest drain discharge into the drainage system?

An ice maker storage chest's drain discharge should use an air gap to ensure that no contaminants from the drainage system can backflow into the ice maker's drain. An air gap is a physical separation between the end of the discharge pipe and the flood level of the receiving fixture, such as a sink or floor drain. This design feature prevents siphoning, which can occur if the ice maker becomes negatively pressurized, thus safeguarding against any potential contamination and maintaining sanitary conditions.

Using an air gap is essential in plumbing systems to comply with health codes and regulations, particularly in food-related areas such as kitchens, where the risk of contamination can have dire consequences. This method promotes safe drainage while ensuring the proper function and longevity of the appliance.

Other choices would not provide the same level of safety against contamination. For instance, simply discharging into a floor drain or through a trap does not offer the physical separation needed to prevent backflow, while relying solely on gravity does not inherently consider the risks of siphoning or contamination.