When calculating the offset for a plumbing installation, which measurement primarily concerns horizontal movement?

The measurement that primarily concerns horizontal movement in plumbing installations is referred to as the run. In this context, the run is the horizontal distance between two points, which is crucial when determining how to align pipes and fittings in a plumbing system.

Understanding the concept of the run is essential for accurately laying out installations and ensuring proper flow and drainage. The run specifies how far the plumbing extends horizontally, which directly impacts the system's design and effectiveness.

In scenarios like offsets or bends in piping, focusing on the run allows for the appropriate accounting of horizontal stretches, ensuring that installations can accommodate changes in direction without causing issues such as blockages or inadequate drainage.