Forever® Vent 4" x 20 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 draft up to 20%. It cost more, but it is well worth the extra expense. Tested and approved to UL1777 zero clearance standards. You won't find a better double-ply chimney liner anywhere guaranteed! "The Chimney Liner That's Preferred By Professionals"™. Stainless Steel Lifetime Warranty. Made in the USA.