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Flex King
Flex King Pro
Flex King Rigid
3 Flex King chimney liner choices that fit all budgets and projects.
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Answer a few questions about your project and we'll show you the best liner for the job.
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What's different about Flex King, Flex King Pro, and Flex King HD? Find out here and select the right liner that works for you.
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What chimney liner kit is right for you?
Answer a few questions and we will let you know which chimney liner you needQuestion 1
What are you venting?
Question 2
What size exhaust is on your heating unit?
Question 3
What length is your chimney?
Click here if you don't know how to figure out the length you needQuestion 4
What type of fuel will you be using?
Question 5
What is the difficulty of your installation?
Question 6
Do you need to ovalize your chimney liner?
Here are the liners that suit your project:
| DIY Lifetime Warranty |  |
| 316Ti Alloy | |
| 2 Ply Construction | |
| Ultra Strong | |
| Super Easy Cleaning | |
| Super Flexible | |
| Easy Install | |
| Smooth-Wall Technology |
| DIY Lifetime Warranty | |
| 316Ti Alloy | |
| 2 Ply Construction | |
| Ultra Strong | |
| Super Easy Cleaning | |
| Super Flexible | |
| Easy Install | |
| Smooth-Wall Technology | |
| DIY Lifetime Warranty | |
| 304L or 316L Alloy | |
| 2 Ply Construction | * double the thickness of 1 ply |
| Ultra Strong | |
| Super Easy Cleaning | |
| Super Flexible | |
| Easy Install | |
| Smooth-Wall Technology | |
| DIY Lifetime Warranty | |
| 316Ti Alloy | |
| Heavy Duty 24 Gauge Construction | * double the thickness of 1 ply |
| Ultra Strong | |
| Super Easy Cleaning | |
| Super Flexible | |
| Easy Install | |
| Smooth-Wall Technology | |
Best budget liner for easier jobs!
- DIY Lifetime Warranty
- 316Ti Alloy316Ti stainless steel is very flexible and is ideal for lining a chimney that is not perfectly straight.
- Super Flexible
- Easy InstallWe provide easy install instructions and are happy to provide help before, during, and after your chimney liner install.
- 2 Ply ConstructionFlex King's 1 Ply Construction is less expensive, but less durable and recommended only for easier jobs.
- Smooth Wall TechnologyFlex King's 1 Ply wall is corrugated which means their will be 20% more creosote build up when compared to smooth wall liners. The ridges also make it more difficult to clean.
- Super Easy CleaningLack of smooth wall technology means there will be more creosote build up and the ridges also make it more difficult to clean.
- Ultra StrongFlex King's 1 Ply construction makes it our least durable liner and is recommended for easier jobs.
- Best Used For:
Easier jobs. Flex King liner can be used for those on a budget on furnaces, boilers, and wood burning free standing stoves.
- Not Recommended For:
Tough jobs.
Great for all but the toughest jobs!
- DIY Lifetime Warranty
- 316Ti Alloy316Ti stainless steel is very flexible and is ideal for lining a chimney that is not perfectly straight.
- Super Flexible
- Easy InstallWe provide easy install instructions and are happy to provide help before, during, and after your chimney liner install.
- 2 Ply Construction2 Ply Construction makes the chimney liner more durable and provides a smooth wall.
- Smooth Wall TechnologyThe smooth wall interior allows you can get up to 20% more draft and less creosote build up for super easy cleaning!
- Super Easy CleaningSmooth walls mean 20% less creosote build up and no ridges for super easy cleaning!
- Ultra Strong2 Ply construction makes this liner strong than Flex King. However, if you are installing a chimney liner in a tight clearance chimney or one that has some jagged edges or extreme offsets, we recommend Flex King HD chimney liner instead.
- Best Used For:
This is the liner with the best value. It can be used for relatively tough jobs. It can be used in furnances, boilers, and fireplace inserts, but is great for wood burning applications because of it's smooth wall construction which can cut down creosote build up by 20% and allows for super easy cleaning.
- Not Recommended For:
Jobs where you are installing this chimney liner in a tight clearance chimney or one that has some jagged edges or extreme offsets.
Most Durable Flexible Liner!
Great for all jobs!- DIY Lifetime Warranty
- 304L or 316L Alloy316Ti stainless steel is very flexible and is ideal for lining a chimney that is not perfectly straight.
- Super Flexible
- Easy InstallWe provide easy install instructions and are happy to provide help before, during, and after your chimney liner install.
- 2 Ply Construction2 Ply Construction makes the chimney liner more durable and provides a smooth wall.
- Smooth Wall TechnologyThe smooth wall interior allows you can get up to 20% more draft and less creosote build up for super easy cleaning!
- Super Easy CleaningSmooth walls mean 20% less creosote build up and no ridges for super easy cleaning!
- Ultra Strong2 Ply construction and HD's extra thickness make this liner our most durable that will take the abuse of a tough installation.
- Best Used For:
Flex King HD provides the highest quality of all our liners making it perfect for the toughest jobs. It can be used for all applications, but is great for wood stoves because of it's lack of creosote build up, easy cleaning, and extreme durabilty.
- Not Recommended For:
Recommended for all applications.
Most Durable Overall Liner!
Best liner for straight chimneys without offsets!- DIY Lifetime Warranty
- 304L (wood) or 316L (all other applications) Alloy24 Gauge Thickness
- Super Flexible
- Easy InstallWe provide easy install instructions and are happy to provide help before, during, and after your chimney liner install.
- Heavy Duty 24 Gauge ConstructionOur thickest liner is as sturdy as a rock and provides a smooth wall.
- Smooth Wall TechnologyGlass Smooth finish for no fuss cleaning!
- Super Easy CleaningGlass smooth finish for no fuss cleaning and minimal creosote build up!
- Ultra StrongOur thickest stainless liner is our most durable and is sturdy as a rock!
- Best Used For:
All appliances where the chimney has no bends or offsets. Requires a straight chimney from top to bottom. This is the most durable chimney liner on the market.
- Not Recommended For:
Chimneys with offsets.
