Final answer:
The extension length of a piping outlet through a floor varies by local code, but a common requirement is 1 inch. Local regulations and a licensed plumber should be consulted for accuracy.
Step-by-step explanation:
The code requirements for how far a piping outlet must extend through a floor can vary based on local regulations and the specific application. Generally, this type of information is included in the plumbing code or building code of a region. Without specific jurisdictional guidelines, it's hard to provide an accurate answer. For many instances, a common requirement is that the unthreaded portion of a piping outlet should extend 1 inch through the floor, but it's essential to consult the local codes or a licensed plumber for the requirements pertinent to your area.