The Importance of Maximum Horizontal Distance in Plumbing

What is the maximum horizontal distance of a trap arm measured from?

1) Weir of the trap 2) Dip of the trap 3) Inlet of the trap 4) None of the above

Answer:

The maximum horizontal distance for a trap arm is determined from the inner edge of the vent to the weir of the trap.

The maximum horizontal distance of a trap arm is measured from the inner edge of the vent to the weir of the trap. The weir is the part of a trap where the water from the fixture is discharged. It's the top part of the trap where the water begins to spill over, and it is essential in maintaining the water seal that prevents sewer gases from entering the building. This measurement is crucial for plumbing compliance and to ensure proper drainage and venting.