How many inches must the unthreaded portion of a piping outlet extend through a floor?

The standard requirement for the unthreaded portion of a piping outlet to extend through a floor is two inches. This measurement is important for several reasons, including safety and functionality. An extension of two inches ensures that there is enough clearance for proper fittings, reduces the risk of potential leaks, and allows for adequate connection with appliances or other types of equipment. Furthermore, this specification helps maintain structural integrity and provides enough space for any necessary insulation or protective measures around the piping. Adhering to this guideline is essential for compliance with safety codes and regulations in gas installation practices.