CPVC duct can handle higher impact sterngth and has better fire resistant capabilities than PVC. It is light weight and easy to handle and install. Available in up to 60" size, CPVC duct pipe is a great choice for air handling systems. Size: 2", Material: CPVC, O.D.: 2.375", Wall: .091", Std Length: 10 or 20 ft. Standards: ASTM D1784