What is a primary function of vent pipes in plumbing systems?

The primary function of vent pipes in plumbing systems is to prevent sewer gases from entering buildings. Vent pipes are crucial components of a plumbing system as they allow air to enter the drainage system, which helps maintain neutral air pressure within the pipes. This balance in air pressure is essential for allowing wastewater to flow freely without creating vacuums that could hinder drainage.

By venting, these pipes also help to expel harmful sewer gases, such as methane and hydrogen sulfide, which can be dangerous and pose health risks to occupants. Ensuring that these gases do not enter living spaces is fundamental for maintaining a safe and sanitary environment within a building.

In contrast, options related to providing water supply pressure, regulating temperature, or serving as a drainage system do not capture the specific function of vent pipes. Venting is distinct from the functions of water supply and drainage, focusing primarily on air flow and waste gas management.