IPC 906.2

IPC 802.1

This installation is correct. Ice machines, food-handling equipment, and similar appliances must discharge through an indirect waste connection to prevent sewage backflow from contaminating food or ice. The 2-inch air gap exceeds the minimum requirement (1 inch or two times the pipe diameter, whichever is greater) and ensures a physical break between the fixture drain and the sanitary system. This is one of the first cross-connection control lessons taught at the UA hall — if it makes food or ice, it gets an air gap.

IPC 905.2

The vent connection must be above the trap weir (the overflow point of the trap). Connecting below the weir makes it a wet vent carrying waste, not a true vent, and will not properly protect the trap seal.

IPC 905.5

Vent pipes must rise vertically to a point at least 6 inches above the flood-level rim of the highest fixture served before turning horizontal. This prevents waste from backing up into the vent.

IPC 909.1 / Table 909.1

For a 1-1/2" trap arm, the maximum distance to the vent is 6 feet per IPC Table 909.1 (Distance of Trap From Vent, Section 909). At exactly 6 feet, this installation is at the maximum but still within code. The slope of 1/4" per foot is the minimum required for pipes smaller than 3 inches. The critical concern is that the pipe fall over 6 feet (1.5 inches total) does not drop the trap arm below the trap weir level.

IPC 912

Wet venting is permitted by IPC Section 912 (Wet Venting) when properly configured. The wet vent must be at least 2 inches and serve as both drain and vent for bathroom group fixtures. The dry vent portion must connect at or above the highest fixture drain, and the wet vent receives fixtures in a top-to-bottom arrangement. This bathroom group configuration is a common and compliant wet vent layout.

IPC 917

AAVs are permitted by the IPC when a conventional vent is not feasible, provided: the AAV is listed (ASSE 1051), installed at least 4 inches above the fixture drain, within the maximum developed length of the trap arm, accessible for service, and the building has at least one conventional vent stack open to atmosphere. This installation meets all requirements.