What is the purpose of vent pipes in plumbing?

The purpose of vent pipes in plumbing systems is primarily to ensure there is proper air circulation, which facilitates efficient drainage. When wastewater flows through the drainage pipes, it creates a vacuum that can impede the flow if not enough air is present to equalize the pressure. Vent pipes allow air to enter the plumbing system, which helps to avoid this vacuum effect. This influx of air ensures that water can flow freely and efficiently through the drainage pipes, preventing issues such as slow drainage or complete blockages.

The other choices discuss functions that vent pipes do not serve. For example, vent pipes do not regulate water temperature, filter out solid waste, or heat water within the plumbing system. These functions are managed by other components and systems designed specifically for those purposes.