The vent for the baffle must be equal in size to which of the following?

The correct choice indicates that the vent for the baffle must be equal in size to the building sewer. This requirement is based on the principle of maintaining adequate airflow and preventing vacuum conditions in the sewage system. The vent allows gases to escape and ensures that the pressure within the system is balanced, which is critical for the proper flow of sewage.

When the vent size matches that of the building sewer, it helps facilitate the effective movement of wastewater while preventing blockages or backflow. If the vent were not adequately sized, it could lead to malfunctions in the system, such as slow drainage or sewage backups, compromising the entire waste disposal process.

In summary, having the vent for the baffle equal in size to the building sewer ensures efficient ventilation, which is essential for the safe and effective operation of the private sewage system.