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Flex Liner Sizing Charts

How do I know what size chimney liner I need?

Please be sure to call us for help with sizing a chimney liner – 1-866-941-5112

Choosing a Length

The best way to size your chimney liner is by dropping a tape measure from the top of the chimney crown and measure the distance from that point to the thimble or opening where your appliance or stove will connect to the chimney. It’s always a good idea to add an extra foot or two just in case.

Choosing a Chimney Liner Diameter

A general rule of thumb is to see what size outlet is on your stove or appliance. In most cases, fireplace inserts require 6 inch diameter chimney liner. Wood stoves generally require between 6-8 in diameter chimney liners.

In any situation you should first consult the manufacturers instructions of your appliance before installing a liner.

Please call us before purchasing a Chimney Liner

Because chimney liners are extremely important to install correctly to keep you and your family safe, we always want you to contact us and confirm that the liner you are about to purchase is the proper size.

If you are planning on installing a liner for a gas or oil burning appliance, we need to know the total input BTU’s of all the appliances that will vent into the chimney liner.

If it is a wood burning appliance, we need to know the size of the flue outlet on the stove.

If it is an open fireplace, we need to know the height and width of the fireplace opening.

Please be sure to call us for help with sizing a chimney liner – 1-866-941-5112

liner charts

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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.

    THANK YOU FOR ANSWERING THOSE QUESTIONS

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    866-941-5112