What is the minimum length piping outlet must extend above the floor where extending through a floor slab?

The minimum length that a piping outlet must extend above the floor when it passes through a slab is typically 2 inches. This requirement ensures that the outlet is sufficiently above the surface to prevent any potential hazards or obstructions, such as water accumulation or debris, that could interfere with the system's operation. Additionally, extending the outlet a minimum of 2 inches helps to comply with safety standards, allowing for easier access and visibility. This height can also accommodate potential fluctuations in floor height due to flooring materials or settling.

Other lengths, such as 1 inch, 3 inches, or 4 inches, do not meet the established safety and functional standards that ensure both the performance and usability of the piping system. A 1-inch height might be inadequate, risking the potential for blockages or challenges in maintaining the system. Meanwhile, while 3 inches and 4 inches may seem to offer additional clearance, they exceed the minimum requirement and may not be necessary for typical installations unless specific circumstances dictate otherwise.