Looking for CPVC duct? We've got what you need. We offer duct in sizes ranging from 2 inches all the way up to 60 inches! Our 2" through 24" duct is available in extruded CPVC. This pipe is lightweight and easy to install. CPVC features a high impact strength and is resistant to fire. Get a quote today! Size: 18", Material: CPVC, O.D.: 18.000", Wall: .187", Std Length: 10 or 20 ft. Standards: ASTM D1784