What is the minimum inside diameter for a manhole used for a cleanout with more than one inlet?

The minimum inside diameter for a manhole used for a cleanout with more than one inlet is established to ensure that there is adequate space for maintenance access, proper flow, and adequate functionality of the plumbing system. A diameter of 54 inches provides sufficient room for personnel to enter, work comfortably, and maneuver equipment as necessary to perform cleaning and repairs effectively.

Additionally, this size accommodates plumbing code requirements which are based on best practices, ensuring that the cleanout can handle multiple inlets without the risk of blockages or insufficient space for maintenance operations. Smaller diameters may limit accessibility and hinder efficient servicing of the system, which is why the specific requirement of 54 inches is set forth in the plumbing codes.