Clean-outs shall be provided at every _____ length or a fraction thereof.

Clean-outs are essential access points in plumbing systems that allow for the maintenance and cleaning of sewer and drainage lines. The requirement for clean-outs at specified intervals is necessary to enable easy access for clearing clogs and ensuring the proper functioning of the drainage system.

The correct interval for providing clean-outs is at every 15 meters or a fraction thereof. This standard (15 m) is established in plumbing codes to ensure that any potential blockages can be addressed effectively without having to disturb large sections of the plumbing system. By implementing clean-outs at this specified distance, plumbers can maintain the integrity of the system while also providing sufficient access for maintenance.

Using a 15-meter interval makes it feasible to keep the drainage system clear and allows for efficient and timely responses to clogs or build-ups that may occur over time. Such a requirement helps maintain the sanitary conditions crucial for public health and safety within building infrastructure.