What is the primary function of a vent in a plumbing system?

The primary function of a vent in a plumbing system is to provide pressure balance. Vents allow air to enter the plumbing system, which helps equalize the pressure in the drainage and waste systems. This balance is essential to maintain proper flow through pipes. When water flows through a pipe, it can create negative pressure or a vacuum. Without a vent, this vacuum can lead to slow drainage or blockages as water struggles to move through the system. By providing an outlet for air, vents ensure that the pressure remains stable, facilitating efficient and effective drainage.

Understanding the role of vents is crucial for proper plumbing design and ensuring that systems operate without issues related to pressure imbalances.