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Flexible Chimney Liner

Cleaning a Flexible Chimney Liner

When cleaning a flexible chimney liner you need to use special care and tools.  You cannot use the standard wire brush you would use for a standard terra-cotta lined chimney.  If you use a wire brush on a flexible chimney liner it will void the warranty and puncture holes in the liner.

To effectively and properly clean a flexible chimney liner you need to use a plastic or polyurethane style chimney brush.  This style of brush is softer than the standard wire brushes and will not damage the flexible chimney liner.  They come in all the standard sizes that chimney liners come in.  You would be best cleaning the chimney from the top.  This will ensure that you can effectively clean the cap and it’s screening.  Also you can do a visual inspection of the liner to make sure everything is in sound condition.

If you are cleaning a flexible chimney liner that vents a wood or coal burning appliance it is recommended to be cleaned at least once a year.  Wood that is too wet can block up a chimney or the screening on the cap in matter of days.  So it will not hurt to clean your flexible chimney liner every month during the burning season.

Be sure you use the proper brush when cleaning a flexible chimney liner.

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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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