What type of pipe is used for venting in plumbing systems?

In plumbing systems, cast iron pipe is commonly used for venting due to its durability and ability to handle a wide range of temperatures and conditions. Cast iron offers excellent sound-deadening characteristics, which is particularly important in vent systems to minimize noise from wastewater movement. Its strength and resistance to corrosion also contribute to its longevity in vent applications.

While other types of pipes, such as PVC and ABS, can be used for venting as well, cast iron is often preferred in commercial buildings and larger installations where sound reduction and structural integrity are critical. Galvanized pipe, though used historically, is less common in modern venting due to issues with corrosion over time. This context helps clarify the advantages of cast iron in plumbing vent systems.