Smooth Wall Flexible Flue Lining Kits

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Smooth Wall Chimney Liner Kit

Smooth Wall Chimney Liner Kit

Bottom Connector Info

Bottom Connector Info

Top Plate Info

Top Plate Info

Rain Cap Info

Rain Cap Info

Smooth Wall Chimney Liner

Smooth Wall Chimney Liner

Smooth Wall Chimney Liner Kit

Smooth Wall Chimney Liner Kit

Build Your Own Kit Rock-Flex Deluxe Smooth Wall 316 Flexible Stainless Steel Chimney Liner & Components KitApplications: Installed in a masonry...

Build Your Own Kit Rock-Flex Deluxe Smooth Wall 316 Flexible Stainless Steel Chimney Liner & Components Kit

Applications: Installed in a masonry chimney typically venting Gas or Oil burning appliances

What's the difference between Smooth Wall Liners and Corrugated Liners?

How this page works:

  • Select Rock-Flex Deluxe chimney liner size and length in Step 1
  • Select kit components for your application in Steps 2-4
  • Click Add to Cart at end for total cost
  • Contact one of our CSIA Certified Technicians if you have any questions

Configure for price:

As low as$1.00

Product Details:

Applications for Smooth Wall Chimney Liner Kits

The Smooth Wall Chimney Liner Kit can be installed inside a masonry chimney for the applications listed below.

  • Gas burning furnace, boiler, or log set
  • Oil burning furnace or boiler
  • Category 1 / Residential

*Always check the manual for the appliance you are venting regarding venting requirements

Details and Features

Due to its superior flexibility and increased BTU capacity, our Smooth Wall Chimney Liner is popular for gas and oil appliances. The smooth interior design allows for more airflow, adding back the 15-20% drag factor that's lost in traditional corrugated liners.

Additionally, our Smooth Wall Flexible Chimney Liner can vent up to 20% more BTU's for gas burning appliances and 15% more gallons per hour (GPH) for oil burning appliances. This is advantageous if you ever replace the appliance or if you need to downsize the diameter of the flex liner.

  • 2 inner linings & superior flexibility
  • 316L Stainless Steel
  • Increased venting capacity for gas & oil
  • U.L. Tested and Listed
  • Category 1 / Residential
  • Free Shipping
  • Lifetime Warranty
  • Complete installation instructions - Most installations will take no more than 2 to 3 hrs. No rivets or clamps required.
  • Customer Support from Rockford's Certified Technicians

Measuring & Installing Your Smooth Wall Chimney Liner Kit

Measuring for your Smooth Wall Chimney Liner is one of the most important steps. Specifically, measure the exact inside measurements of the chimney flue or brick chimney, this will ensure the chimney liner will fit down your masonry flue.

Be sure the proper size liner, sized to the appliance you are connecting to, will fit down your current masonry chimney. Here is a link to our helpful measuring guides.

Additionally, view our easy-to-follow chimney liner installation video. For Smooth Wall Chimney Liners, be sure the red arrow is pointing up.

How to Order a Smooth Wall Chimney Liner Kit

Customize your Smooth Wall Chimney Liner Kit step by step with our easy ordering menu. Included in your chimney liner kit:

Step 1: Smooth Wall Flexible Stainless Steel Chimney Liner

316L Stainless Steel Smooth Wall Chimney Liners - Air and water tight, with 7 ply 316L stainless steel and 2 inner linings (.013 total thickness) for great flexibility and resistance to corrosion. UL Listed and made of the highest quality, hand picked, prime stainless steel made in the United States. Fuels include gas, oil, wood, pellet, and coal.

To begin with, select the proper size diameter chimney liner for the appliance you are connecting to. If you need assistance sizing, contact one of Rockford's Certified Technicians and we will be happy to assist.

Note: The sizes give in the menu are inside diameters. Add 1/4" for the outside diameter of the liner.

Next, select the proper length for the chimney height. We fabricate each liner kit in five foot increments. You will want to round up and choose the liner length that is the nearest length.

Optional Insulation

One of the most frequently asked questions is "Do I Need to Insulate My Chimney Liner?". Most often, for solid fuels, the answer is yes and typically required. On the other hand, for gas and oil, it's recommended, but not always required. Here are a few articles we've written to help you understand chimney liner insulation requirements.

Step 2: Bottom Connector

Secondly, you will select the Bottom Connector, which will connect the flexible chimney liner to the appliance. In general, there are two different styles of Bottom Connectors.

The first option is a Two-Part Tee Connector. Use the Tee Connector to connect horizontally to the appliance or to the connector pipe inside the room. This is a two-part Tee Connector with a removable snout. Tee Connector Installation Video

The second option is a Vertical Appliance Connector. Use the Vertical Appliance Connector to connect directly to the top of the appliance.

You will find an application summary for each Bottom Connector in the dropdown menu. Keep in mind, the connectors are made to fit around the flex liner and will be 1/4" to 1/2" larger than the diameter listed.

Step 3: Top Plate

Thirdly, you will select a Top Plate size which will terminate and secure the chimney liner in place at the top of the chimney. Choose the size & style top plate that will fit your chimney flue tile or brick opening.

You will find an application summary for each Top Plate in the dropdown menu. See our Top Plate Options Overview Video for additional information.

Step 4: Rain Cap

Lastly, select a Rain Cap to place over the collar on the Top Plate. This will protect & keep critters, debris, and weather out of the chimney flue.

Add to Cart

Add the product to your cart to view pricing and summary of the chimney liner kit build.

Need More Help?

Contact one of Rockford's Certified Technicians today to help answer your questions and assist in planning your installation. Our Technicians are CSIA and NFI Certified; ready to take your call, email, or text.

Why Choose Rockford's Smooth Wall Chimney Liner

We offer the best protection for you and your home. Air and water tight chimney liners, seven ply seams that lock moisture and flue gases in the flexible flue liner which keeps them from leaking into the home.

Guards Against Corrosion - Certified stainless steel chimney liners protect against hostile acids which deteriorate masonry clay tile chimneys.

What About Creosote? - Rockford chimney flue liners do not allow creosote to leach through the liner unlike masonry, clay tile flues, or liners not made of prime stainless. Creosote can catch fire, but installing a chimney liner minimizes harmful creosote.

Seals Off Carbon Monoxide - When it comes to safety our flexible chimney liners will protect the structure of your home from moisture damage and the very real potential of carbon monoxide poisoning.

UL Listed in the USA and CANADA - Our stainless steel flue liners and components are UL Listed UL1777. UL is the leader and most recognized, don't settle for less.

Lifetime Transferable Warranty - The best warranty anywhere, transferable to new homeowner if you decide to sell. You're going to feel good about this purchase, plus you're adding value to your home.

316L Smooth Wall Liner - A unique titanium alloy designed to resist flue acids and the extreme stresses of hot and cold cycles. It can withstand multiple heating cycles up to 2100 degrees.

Rockford carries a complete selection of chimney liner supplies. Our hearth liner kits and components are premium stainless-steel and 100 percent manufactured in the USA. Buy chimney liners online at Rockford Chimney Supply and you are guaranteed to be getting the best chimney liner supply and lining system available. In summary, our service, price, & quality is unmatched, anywhere.

With attention to Canadian customers, please use our US Border Depots to save on shipping.

Help & Documents:

Complete Installation Instructions

"DIY chimney liners installed the easy way." Most installations will take no more than 2 to 3 hrs. No rivets or screws required. Chimney liner installation instructions.

Lifetime Forever transferable chimney liner warranty.


Customer Reviews

Based on 3 reviews
Retrofit fireplace

I used this to install an old cast iron stove into an existing fireplace opening. This worked great, provided excellent draft and seems really durable. After one full season of burning about two cords through the liner I can say this product was exactly what I needed to install my appliance and it was priced extremely well. The only complaint I can think of was that the cap wasn't really correct for what I had existing, but I was able to make it work.

Improved bad draft

Fast delivery helpful staff liner works perfectly

Liner for Chimney

This worked perfect for my situation. They walked me through EVERY STEP, and that was a huge help sense I didn’t have an experience doing this. Can’t reccommend them enough!

Frequently Bought Together:

DIY Center

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Our 316Ti flexible chimney liner and chimney liner components have passed the rigorous testing at the Underwriters Laboratories with best in class status and are UL Listed. So if you are looking for UL listed chimney liner sold directly to homeowners, then look no further than Rockford Chimney

Customer Testimonials

Back in July you gave me excellent advice re. sizing/purchasing a flue liner for the chimney associated with my wood stove. I'd like to thank you once agai... More

—AE Northfield, MN

A few weeks ago I ordered a chimney liner system for my fireplace insert. Your salesman recommended the liner system plus the insulating blanket. I just wa... More

—AH Happy customer

Just got around to installing my new smooth flexible liner and deluxe terra cotta cap (wow). The quality of your product is second to none. Very pleased an... More

—B.B. from Massachusetts

Thanks so much for the great tech service from Dennis, very knowledgable, friendly and proffessional.Your website is the best, beats your competition by fa... More

—Bill in Knoxville

Sue and Dennis, I received the final part of my order yesterday (the chimney cap that actually fits over the chimney chase). It looks wonderfu... More


Hello, I was shopping for an fireplace insert and called RCS to ask why they were so much cheaper than my local guy, the reply was " we sell thousand of th... More

—Chris, PA.