Which type of pipe is generally used for venting purposes?

The type of pipe generally used for venting purposes is PVC pipe. PVC, or polyvinyl chloride, is favored for venting due to its lightweight, corrosion-resistant properties, and ease of installation. It effectively handles the pressure changes and potential chemical exposure that can occur in venting applications.

Furthermore, PVC is non-toxic, does not rust, and has a smooth interior that promotes airflow, making it ideal for vent systems that need to transport gases and air efficiently. Its ability to withstand various temperatures also makes it suitable for venting duct systems that can experience fluctuations.

The other materials mentioned have their own applications but are not the primary choice for venting. For instance, ABS is often used in drainage but can be less effective in high-heat applications. Copper is excellent for water supply lines but is more expensive and less commonly used for venting due to its susceptibility to corrosion over time in certain environments. Cast iron is durable and often used in larger vent systems, particularly in older buildings, but is heavy, requires more labor to install, and is not as effective in modern residential venting systems as PVC.