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Flexible Chimney Liners

Click Here to view an OVAL, SQUARE, or RECTANGLE liner sizing chart.

Check out our ovalized chimney liner Flexible Chimney Liner Installation Video

What are the differences in Chimney Liner Metal Alloys

You found your way to this site, so you must be interested in doing the job yourself. So lets discuss some options you have and the types of stainless steel chimney liner that are out there.

You can choose to use either a rigid stainless steel chimney liner or flexible pipe. Flexible pipe should be used if your chimney is less than perfectly straight with no offsets.

Rigid stainless steel chimney liner is the best product available to line a chimney. It’s thick, and cleans the best. It’s the most durable and will never rip if you clean it aggressively. Light flexible chimney liners need to be cleaned with a type of plastic chimney brush because they are so thin.

There are different types of thicker more durable flexible liners available. Flex King Pro is a 2 ply, smooth interior liner. It cleans much better than standard Flex King liners and is more durable.

Heavy Flexible liners are very thick and durable. The only problem with them is that they are very heavy. A homeowner may have some trouble when installing a heavy flex stainless steel chimney liner.

Buy Flexible Chimney Liner Now

If you are going to purchase a light flex stainless steel chimney liner you should buy one that is made from 316TI stainless steel. A lot of lesser quality liners are made from 316L. The TI stands for titanium. The addition of titanium gives the liner the ability to withstand less than perfect chimney conditions.

Click here for more information about DIY chimney liner projects

Chimney Safety Institute of America

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    *Note: If you have a terra cotta clay chimney
    flue lining, be sure to measure the true length and width of the
    inside of your chimney flue space.

    *If there is a terra cotta clay flue liner, does it protrude out of
    the top of the chimney at least 2 inches? If there are at least 2
    inches and the terra cotta clay is in good condition, you will use
    our stainless steel, terra cotta top plate that has a 1 1⁄2inch edge
    that goes all the way around (like a shoebox lid).

    *If your terra cotta clay flue is in bad shape at the top, you may
    need to just take a hammer and tap all around that terra cotta,
    taking it away to make the surface flat at the top of your chimney.
    In that case, you will simply use the flat top plate that comes with
    our liner kit.



    *Note: If you have a terra cotta clay chimney
    flue lining, be sure to measure the true length and width of the
    inside of your chimney flue space.

    *If it is on the back of the stove, is it parallel with the back of the stove or is it at an angle, like 45 degrees?

    *If it is at an angle you will use an insert stove adaptor (an insert liner kit) rather than a two-part tee with cleanout cap.


    Usually pellet stoves have an exhaust hole id of 3 inches. However, if you are going up more than 15 feet to the top of your chimney you need to use a pipe and/or flex liner that is 4 inches diameter.





    If you are only venting a hot water heater then the exhaust hole diameter is probably 3 inch diameter. If it is 3 inch diameter and you are going up more than 15 feet to the top of your chimney, you must use a 4 inch diameter flexible liner or ridged pipe for proper draft. We also suggest to go ahead and use a 4 inch diameter flexible liner or ridged pipe even if the total length is 15 feet or less.


    Not the depth or any other dimension inside your fireplace.

    Most gas log fireplaces require an 8 inch liner kit or rigid kit. But do not assume that is the case for the gas log fireplace kit you are installing. Obey the requirements for that specific unit that are in your installation/instruction manual.

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