The Chimney Sweep Online Fireplace, Woodstove, Gas Stove and Barbecue Shop
Stainless Steel Chimney Liner Kits
Woodburning stove installations often require the installation of a stainless steel liner inside the existing chimney. Forever Flex relining kits offer
an easy way to accomplish this, all in one box! To read about why and when a stainless liner is required, click here.
What's better than a lifetime warranty? How about forever! Forever Flex's unique warranty covers not only the original purchaser for life,
but should the original homeowner decide to sell their house, the warranty transfers to the new owner! Click here for more info.
Standard Features - Forever Flex Stainless Chimney Liner
- 316 Ti* Stainless resists flue acids, extreme hot/cold cycles
- 7-ply seams lock in creosote & flue gases, can't kink or crush
- Withstands multiple exposures to chimney fire temperatures
- Listed to UL 1777 standard by Underwriter Laboratories
- Unique Forever Warranty transfers to future home buyers
*The Ti in 316 Ti stands for Titanium, which is added to the composition of the stainless steel. Titanium stabilizes the alloy at extremely high
temperatures of 800 degrees and above, which can occur during a chimney fire. Titanium combines with carbon, preventing the precipitation of
chromium carbide from the material, which in turn limits chromium depletion and susceptibility to corrosion. A 316 Ti alloy can be held at higher
temperatures longer before sensitization occurs than in a non-stabilized alloy like 316L.
Sizing Your Chimney Liner
The ideal size for a stainless liner is the same diameter as the exhaust collar on the appliance.
If the liner is too small, it may not allow the exhaust volume necessary for efficient operation.
If it is too big, it may draft too slowly at startup, and develop too much updraft when it finally
To read more about flue undersizing, click here.
To read more about flue oversizing, click here.
A possible exception: If the appliance has a 6" flue collar and there isn't room in the existing
chimney flue for a 6" liner, consider using a 5.5" liner. For chimneys at least 20' tall, this
slight size reduction almost always works.
A Kit for Every Installation
The Problem: some older inserts
rectangular or oval exhaust openings.
No way to connect to round liner!
Or..... Is there?
The Solution: the Rectangle to
Round Insert Adapter Boot
Covers rectangular openings
up to 9-1/8" x 14-3/4",
adapts to 6", 7" or 8" round
Sizing your Insert Boot:
Measure the exhaust opening
If A x B < 28".................. 6"
If A x B > 28" and <39"... 7"
If A x B > 39".................. 8"
Order Boot size shown in blue -
Boot Size determines Liner Size
|Insert Adapter Boot, 6", 7" or 8" Round|
+ $20.00 S&H*
10-1/8" x 15-3/8" x 5-1/2" Tall
Angled for easy connection to liner
*Item ships Free with Liner Kit
20" Tee Snout
Replaces standard 10" snout
+ $15.00 S&H*
*Item ships Free with Liner Kit
Pulling Cone w/ Rope Eyelet
Helps guide liner through tight offsets
+ $15.00 S&H*
*Item ships Free with Liner Kit
|Adjustable Low-Profile Offset Box|
With removable cleanout panel
+ $20.00 S&H*
Offset: 0" - 6"
Offset: 0" - 8"
*Item ships Free with Liner
To Wrap, or Not to Wrap?
Our Top Sealer Plates seal so tightly, they virtually prevent the flow of air up the flue around the
outside of the liner. This creates "dead air insulation" around the liner, and in most installations in
code-approved chimneys, no further insulation is required. There are some instances, however, when
additional insulation is recommended or even required. To read about when you should insulate your
stainless liner, click here.
If you decide to insulate your liner, the best way to do it is with our Super Wrap insulation kit. Unlike
typical ceramic blanket insulation, Super Wrap doesn't cause skin or lung irritation, and is not
classified as carcinogenic. Super Wrap is foil-backed, only 1/2" thick, light weight and extremely
easy to install.
Insulation Wrap Kit:
* Foil-Backed 1/2" Blanket
* Spray Adhesive
* Metal Tape
* Steel Mesh "Sock"
* Top & Bottom Clamps
Insulating Wrap Kit Pricing:
To read about installing a free-standing woodstove or wood hearth stove liner, click here.
To read about installing a wood fireplace insert liner, click here.
To read about installing the insulation wrap kit, click here.
Not sure what length to order? Click here.
Before you order a liner kit, please
INSPECT YOUR CHIMNEY AND
MAKE SURE IT WILL FIT !
(20% Restock Charge on Returned Items)
Just wanted to let you know how great the wood stove is working after installing the flex liner kit. My son and I installed it . Because of the
heatilator , we had to cut out some of the metal in the center to make enough clearance for the 6" flex liner, but all went smoothly.
Thanks again for your prompt service.
Edwin A Emerson Jr
I need your help. I think I got some bad advice from my local dealer. I did my own install of a Hearthstone Homestead stove, and my local dealer
advised me to go with 5 inch solid pipe with insulating wrap because the recommended 6 inch pipe with insulation would not fit into the flue tiles
lining my chimney. They assured me the difference between a 5 inch and 6 inch pipe was insignificant. The chimney is not too tall; only about 13
feet from smoke shelf to top, and I lined the whole flue and installed a cap. The stove works fine, but it is almost impossible to open the door to add
more wood without some smoke wafting into the house. Would I have been better off with a solid 6 inch non-insulated pipe? Can I improve things
by extending the length of pipe sticking out of the chimney (lengthening the chimney)? Would a VacuStack help? I would appreciate your opinion.
The minimum vent size for a given woodstove model is not arrived at arbitrarily: it is determined during meticulous laboratory testing. This
is why Hearthstone states in their brochure, on their website and in the Homestead owners/installation manual that 6" connector pipe and chimney
is the smallest size that may be used.
A 6" round liner has a cross-sectional area of 28.28 sq.inches. Your 5" liner has a cross-sectional area of only 19.64 sq. inches, which is a flue size
reduction of 30 percent! Further, 13 feet is the absolute minimum chimney height specified in the manual. Minimum means all other factors must be
nearly perfect to ensure adequate updraft in a 13 ft. chimney. The combination of flue undersizing and barely-adequate chimney height reads like a
recipe for inefficient burn and smokeback into the house.
You can't extend your flue height with liner pipe: lined masonry or insulated manufactured chimney pipe is required above the existing structure, to
prevent the tremendous loss of updraft and excessive creosote formation that results when wood exhaust cools in the flue. You could add courses of
brick to the chimney to allow extension of your 5" insulated liner within, but in our experience, it would likely require an extreme height addition to
compensate for a 30% reduction in liner size.
The Vacu-Stack draft cap works on Bernoulli's principle, and will only function when wind is blowing directly onto it. The rest of the time, it has no
effect on chimney draft. The only way we'd recommend a Vacu-Stack to improve your situation is if it is windy all the time where you live.
Had you consulted us prior to your Homestead purchase, we'd have recommended 6" liner with a tight-sealing top plate to provide dead air
insulation, and would have advised you that even then, you might have to extend your chimney height to ensure adequate draft, especially during
times when flue gas temperatures and/or atmospheric conditions aren't ideal.
I would like to thank you guys very much!!! The insert liner kit worked out perfectly. Easy to install and fit perfectly into the opening on top of my
Saved 2700 dollars by purchasing the stove as well as the liner kit online and doing it myself!!!
Excellent web site lots of great information and insight.
I appreciate you responding to me so quickly. You shipped my liner quicker then I was expecting, and have answered all my questions in a timely
If I come across any homeowners who need to reline their chimneys, I will recommend your company hands up.
Thanks again for a job well done.
Damien M. Bricka
Q: How do I determine flue length to see how much liner I need? Thanks... I love the info you provide
We discuss several techniques to determine flue height in our Sweep's Library. To open that page in a new window, click here.
I am so glad I purchased my Forever Flex Liner Kit from you folks! After going to my local home repair store and seeing the kit they sell, made in
China, poorly constructed ducting and one-size-fits-all parts that have to be forced together and then riveted or screwed, at a HIGHER PRICE
than you charged me for the far superior Forever Flex kit. I try to buy products made in the USA, not only to support our economy and American
Workers but because I believe we can make a quality product in America.
When I came home today, my wife Joanne said "The hand of God left your box from The Chimney Sweep" I had to laugh, but realized it wasn't
even 48 hours since we ordered. Impressive! (Great Job by FedEx also) When I inspected the contents for damage, I found none and a very neatly
organized kit. All welded parts, adjustable clamps fitting together perfectly without any real effort to a primary snug fit, then secondary holding
with a clamp. Your insight on the large size of my chimney was very helpful to get the right top plate for the kit also.
Thanks to all the folks at The Chimney Sweep who work so hard to be The Best!
I will email again when the warranty runs out....next life?
Thank you so much for the fast response and all the help. The product was very well built and I was very pleased with the shipping and packaging.
This is the best on-line transaction I have had.
Thank you again,
Got the kit and insulation first thing Tuesday morning (after only ordering it late the previous Friday afternoon) and installed it that day. Had a fire
going Wednesday morning and it all worked GREAT. Thank you for Superb service on the phone and Superb delivery time. Instructions were easy
to follow (especially after watching the video). A really nice experience from start to finish with The Chimney Sweep.
The Chimney Sweep, Inc.
913 Harris Avenue
Bellingham, WA 98225-7032
1(888)-354-6722 toll-free in U.S. & Canada
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