Residential ejector vent size is which of the following?

Residential ejector vent size is which of the following?

• A. 1 inch
• B. 4 inch
• C. 2 inch
• D. 3 inch

Answer: (C)

Sizing the vent for a residential ejector system focuses on letting air move freely as the pump pushes wastewater out of the pit. When the ejector pumps, it creates pressure and suction changes in the drain line, and the vent provides a steady air path to prevent trap siphonage and backpressure on the system. For a typical single‑family home, the minimum vent diameter is two inches. This size is large enough to accommodate the air needed to balance pressures without choking the flow, yet not so large as to be unnecessary for a standard residential load. A smaller vent would restrict airflow, increasing the risk of siphoning and pump inefficiency, while a much larger vent isn’t normally required for standard homes.

Sizing the vent for a residential ejector system focuses on letting air move freely as the pump pushes wastewater out of the pit. When the ejector pumps, it creates pressure and suction changes in the drain line, and the vent provides a steady air path to prevent trap siphonage and backpressure on the system. For a typical single‑family home, the minimum vent diameter is two inches. This size is large enough to accommodate the air needed to balance pressures without choking the flow, yet not so large as to be unnecessary for a standard residential load. A smaller vent would restrict airflow, increasing the risk of siphoning and pump inefficiency, while a much larger vent isn’t normally required for standard homes.