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Chimney Fires and Chimney Liners

Some people think that if you have a metal chimney liner installed in your masonry chimney that a chimney fire won’t be that dangerous. Let’s first start out by saying that a chimney fire is dangerous no matter what.

What causes a chimney fire?

If a chimney builds up creosote (which all wood burning stoves will do) there is a potential for a chimney fire to start in the chimney liner, whether it is made of metal or masonry/terra-cotta. It is incredibly important that if you burn wood you have your chimney cleaned annually even semi-annually if you burn a lot of wood.  Unseasoned wood also will increase creosote build-up dramatically.

How can a metal chimney liner help during a chimney fire?

If a chimney liner is properly installed it can help keep the fire contained in the chimney. Properly installed means, insulated with 1 inch high temperature chimney insulation wrap, or insulation mix. This is not normal insulation. It is specifically designed for a chimney and can deal with temperatures up to 2000 degrees. When a chimney fire spreads to a house it is usually because of cracks in the chimney. Also, the masonry can get incredibly hot and in some cases ignite nearby combustibles.

If you have a metal chimney liner installed and it is insulated this can contain the flames and contain the high temperatures. A metal chimney liner should never be thought of as a device that needs little maintenance. A metal chimney liner must be cleaned just like a chimney without a 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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