IPC 802.1
What it means on the job
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.
Tested in 1 CraftIQ puzzle
- code-checkUnion Training: Indirect Waste for Ice Machine
Related IPC sections
IPC 705.5
ABS and PVC cannot be joined with solvent cement. These dissimilar plastics require a listed mechanical coupling (such as a banded no-hub coupling) or approved transition fitting.
IPC 706.3
Sanitary tees may only be used for vertical-to-horizontal transitions. For horizontal-to-horizontal connections, a wye with 45-degree bend or combination wye-bend must be used to maintain proper flow.
IPC 708.3
This cleanout layout meets IPC requirements. Cleanouts are required at the base of stacks, at each aggregate change of direction greater than 135 degrees (45 degrees from straight), and at maximum 100-foot intervals for 4-inch and larger drains (75 feet for smaller drains). The installation is compliant.
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 906.2
Crown venting (connecting the vent at the top of the trap) is prohibited because it creates a cross-connection path and can siphon waste into the vent. The vent must connect to the trap arm downstream of the trap.
CraftIQ explanations are original educational commentary written in trade language and verified against the cited standards. Always confirm requirements against the code edition adopted by your jurisdiction — this is training material, not a substitute for the code book or your AHJ.