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Flex King Vs. Flex King Pro

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Flex King Vs. Flex King Pro

Many people see our Flex King and Flex King Pro chimney liners and wonder what chimney liner is best for their application.  There is no one answer that fits all.  Lets talk about when you would use a Flex King or a Flex King Pro first for a wood stove, then an oil furnace and finally a gas furnace.  You can clearly see the differences between the Flex King (on the left) and the smooth inner wall Flex King Pro (on the right).

flex king, chimey liner interiorflex king pro, chimney liner interior, smooth wall chimney liner

Flex King Pro for Wood stoves

Generally we will say Flex King Pro is the best liner for wood stoves.  This is because it has a smooth inner wall.  That smooth wall creates for better draft and less creosote build up.  So if you plan on using your wood stove for more than just the occasional fire, the Flex King Liner is what you want.  If you are not going to burn your stove regularly, possibly just here and there on weekends, the Flex King will work just fine for you.  One thing you need to use, no matter what liner you install for your wood stove, is insulation.  Click here to learn why it is required.

So the verdict is if you burn more than here and there, install the Flex King Pro for your wood stove.

Flex King or Flex King Pro for Oil

Oil furnaces can go either way.  Sometimes it is recommended to use a Flex King Pro and other times a Flex King.  This is mainly determined on how well the furnace burns.  Sometimes an oil burner can be sensitive to draft, especially when the chimney is shorter than normal.  Sometimes the oil burner does not burn very clean and creates a thick soot in the chimney.  This can lead to a blocked chimney.  We highly suggest hiring a furnace specialist to clean and adjust the furnace immediately.  So if you have no issues with draft, your chimney is plenty tall enough and the furnace burns clean you can use the Flex King chimney liner.

Flex King for Gas Furnaces

The modern gas furnaces burn fairly clean.  When there is perfect combustion water is one of the by-products.  This is not just any water, it has acids within it.  This is no good for masonry chimneys.  The masonry will soak in the water and the acids will quickly eat away at the terra cotta flues and the bricks or blocks.  To prevent this damage you need to install a Flex King chimney Liner.  Some high efficient furnaces have cooler exhaust temperatures so the water condenses quickly inside the chimney.  In rare cases the water condenses at such high rates inside a cold chimney, water can be seen leaking out of the bottom of the chimney.  If you have this problem, you will need to insulate the chimney liner to keep that water inside the chimney as a steam.  This will prevent it from condensing and causing more problems.

If you have further questions, please contact us. We will help you decide what Flex King Liner will be best for you.

phone: 1-866-941-5112         email: [email protected]

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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.