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Forever Flex

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!

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.

A Kit for Every Installation

Wood Stove Liner Kit: * Rain Cap * Top Sealer Plate * Flex Liner * Tee w/10" Snout, Cap * Silicone Sealant 20' 25' 30' 35' 40' 45' 5" $415 $475 $540 $595 $660 $715 5.5" $445 $510 $575 $630 $710 $770 6" $475 $540 $615 $665 $760 $830 8" $580 $660 $780 $875 $970 $1060	Wood Stove Liner Kit		Fireplace Insert Liner Kit	Fireplace Insert Liner Kit: * Rain Cap * Top Sealer Plate * Flex Liner * Flue Collar Adapter * Silicone Sealant 20' 25' 30' 35' 40' 45' 5" $385 $445 $510 $565 $630 $685 5.5" $415 $480 $545 $600 $680 $740 6" $425 $510 $585 $635 $730 $800 8" $550 $630 $750 $845 $940 $1030
	Note: Liner pricing shown includes residential delivery, Continental US!

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, no further insulation is required. There are some instances, however, when additional insulation is recommended or even required. To maintain its listing to the UL 1777 Standard, additional insulation must be added to your Forever Flex Liner installation if both these two things are true: Your existing chimney is unlined, partially lined, or has a liner with open cracks in it AND There are combustibles physically touching the chimney at any point. There are also times when additional insulation is a good idea, even when it is not required, to ensure flue temperatures warm enough to create good draft. You might consider insulating your liner if either of these two things are true: There will be more than 4" airspace between the liner and the chimney flue. OR One or more of the chimney walls is exposed to outdoor temperatures for its entire length. 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: 25' 30' 35' 5" $295 $340 $380 5.5" $295 $340 $380 6" $295 $340 $380 8" $485 - -

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.

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Hi! Tom!
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 heatalator , we had to cut out some of the metal in the center to make enough clearance for the 6" flex liner. Thanks again for your prompt service.

Edwin A Emerson Jr

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Q: Hello,
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.
Thanks,
Vince Roscigno

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.

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2/7/08:

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 insert.

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.

Thanks again.
Arnie Appleby

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5/9/08:

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 fashion.

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

P.S. If you want to use my e-mail as a testimonial you are more then welcome to do so.

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7/3/08:

Q: How do I determine flue length to see how much liner I need? Thanks... I love the info you provide
-Kate Pavelle

We discuss several techniques to determine flue height in our Sweep's Library. To open that page in a new window, click here.

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