What is a branch vent?

A branch vent is defined as a system of pipes that connects one or more individual vents to a vent stack, thereby ensuring that the plumbing system can properly vent gases while simultaneously maintaining the necessary air pressure within the drainage system. This is critical for preventing siphoning of traps, which could lead to sewer gases entering the living space. By connecting individual vents, branch vents help to facilitate the ventilation of multiple fixtures, ensuring that the system operates efficiently and safely.

This function of connecting to a vent stack is vital because it allows the plumbing system to ventilate properly, balancing pressure and providing a way for air to flow in, which is necessary for drainage systems to function without obstruction. Without branch vents, individual fixture vents would not be able to communicate effectively with the larger venting system, leading to potential drainage issues or the buildup of harmful gases.