Flexi-Liner is UL listed to the UL 1777 standard as a liner for masonry chimneys serving B vent rated gas fired heating appliances with an AFUE of 83% or less. Flexi-Liner is made of 2 ply, 3003 aluminum and features a 15 year pro-rated, limited warranty. It has the unique gas tight, patented seam, and it's super flexibility makes even the most challenging chimneys possible.

  
Flexi-liner Aluminum Chimney Relining Pipe