National Chimney 4" x 50' Aluminum Liner (for gas only)

National Chimney offers pre-insulated M-Flex chimney liners with your choice of Stainless Steel or Aluminum outer protective liner. The Aluminum outer liner offers better flexibility and ease of handling, whereas the Stainless Steel outer liner offers durability. Both are manufactured using their highest quality, mill certified 316L Stainless Steel M-Flex inner liner and our 1/2" insulation wrap. This convenient liner will save you time and frustration on the job.