100% Made In The USA

Smooth Wall Flexible Flue Liner Only

Rock-Flex Deluxe 316 – Rockford Smooth Wall Flexible Stainless Steel Chimney Liners
DIY Rockford stainless steel flexible chimney liners, without components, flue liners only.
APPLICATIONS: Wood, pellet, gas, oil, and coal burning appliances

Note: Because of its special construction, smooth wall flexible liner cannot be ovalized or shaped in any way. If you need a shaped liner, please see our oval, square or rectangle chimney liners.

smooth wall chimney linersmooth wall chimney liner closeupsmooth wall chimney liner cutaway view
Smooth inside for better air flow

Due to its superior flexibility and increased BTU capacity, our smooth wall liner is gaining in popularity. Its smooth interior design allows for more airflow, adding back the 20% drag factor that's lost in traditional corrugated liners. And since it's made of 7-ply 316 stainless steel and 2 inner linings (.013 total thickness), it's great for any application. You can use it with all of our round liner components.

What size liner do I need?

100% stainless steel and 100% made in the USA. To buy a chimney liner online, simply use the drop down box below, or call us toll free at 1-866-708-2446. If you're looking to buy chimney liners online, Rock Flex liners are the right product at the right price! Need a chimney flue liner kit? View our Chimney Liner Kits.

Rock-Flex Deluxe 316 Flex Liner
The sizes give in the menu below are inside diameters.
Add 1/4" for the outside diameter of the liner.

PLEASE NOTE: When installing Smooth Wall Liner, install with RED ARROW pointing UP.


  • 316 flue liners can be used with burners of fuels such as wood, pellet, gas, oil, and coal.
  • Rock-Flex 316 Stainless Steel Flex Chimney Liners are air and water tight, they have 7 ply seams (most liners only have a 2 ply seam, cheap) with 10 corrugations per seam for the very best flexibility and strength on today's market.
  • We offer only the best protection for you and your home. Fireplace liners are air and water tight, with seven ply seams which prevent moisture and flue gases in your chimney from leaking into the home.
  • Stainless steel flue liners are delivered free of shipping charges and taxes. Complete installation instructions and a Lifetime Forever Transferable Warranty which adds value to the sale of your home if you ever decide to sell your home.
  • 316 is a unique alloy designed to resist acids in the flue as well as the extreme stresses of hot and cold cycles. 316 can be used with all fuels wood, coal, pellet, gas and oil. It can withstand multiple heating cycles up to 2100 degrees.
  • Because our 316 Flex Liner is manufactured using prime certified stainless steel you can rest assured it is guaranteed to guard against corrosion and hostile acids which deteriorate clay tile and masonry chimneys.
  • What About Creosote? Rock Flex liners do not allow creosote to leach though the liner, unlike clay tile, masonry chimney flues, and cheap stainless steel chimney liners. Creosote can catch fire, and lead to a house fire. Thanks to Rock flex, this harmful creosote is contained.
  • Seals Off Carbon Monoxide - Rock Flex 7 ply seamed liners protect the structure of your home from moisture damage and from the very real potential of carbon monoxide poisoning.
  • UL Listed in the USA and CANADA - Our stainless steel flue liners and components are UL tested and listed to UL1777 standard, Underwriter Laboratories. UL is the leader and most recognized in the United States, don't settle for less.
  • Lifetime / Transferable Warranty - The best warranty anywhere, and it is transferable to the next homeowner. Rock-Flex chimney liners are manufactured in the USA using premium forever stainless steel and we back it with a lifetime warranty regardless of who installs it. Do not settle for less. You're going to feel good about this purchase, we make it our business to keep you satisfied.

At Rockford Chimney Supply you are guaranteed to get the best flexible chimney liner supply available on today's market. Our service, price, and quality is unmatched, anywhere.

The Original Online Chimney Supply Co.