Forever® Vent 4" x 30 ft Double Ply SmoothWall™ Flexible Chimney Liner Coil

Double Ply SmoothWall™ Stainless Steel .012 thick material. Chimney Professionals around the world use SmoothWall™ Chimney Liner for their chimney relining jobs. Why? Because its corrugated outer ply provides maximum strength and flexibility and it's SmoothWall™ inner ply improves the chimney's draf