What kind of materials are prohibited for gas dryer venting?

Plastic ducts are prohibited for gas dryer venting primarily due to safety concerns. Gas dryers produce high temperatures, and plastic materials can easily deform, melt, or ignite under such heat. Additionally, plastic ducts do not provide the same level of durability or fire resistance as other materials, increasing the risk of fire or venting failure.

Steel, flexible, and aluminum ducts are typically used in dryer venting as they can withstand the necessary temperatures and provide effective venting without risk of combustion. Steel ducts, for example, are sturdy and can handle the high heat of exhaust gases. Flexible ducts, while often subject to local code requirements regarding their use, are made from materials that can tolerate dryer temperatures when properly installed. Aluminum ducts are lightweight, resistant to corrosion, and can also endure the heat generated by a gas dryer. Therefore, the safest and most reliable materials for gas dryer venting are those that maintain structural integrity and safety at higher temperatures.