Call Now and Save!
1-866-941-5112

Insul-Flue; 8in Thimble Only (no cover assembly)

thimble-only

$693.22

Available on backorder

SKU: CF34075. Category: .

Use this UL Listed thimble when you need to pass through a combustible wall and into a masonry chimney. It is sold in two parts, the thimble cover assembly and the thimble itself – both are required. You need one thimble cover assembly per installation. The thimble cover assembly protrudes 13 inches inot the room.

Full Assembled Thimble (parts sold separately)

You may use one or two thimbles, depending on the thickness of the combustible wall. A single, 8 inch long thimble will pass through a wall of 7 inches. You can go through a wall up to 15 inches thick if you cemement two thimbles together with Stove and Gasket Cement. Thimbles may be cut shorter with a hacksaw to achieve the desired length.

The thimble requires a 15 inch or 17 inch square opening for use with 6 inch or 8 inch diameter pipe, respectively. The thimble cover assembly plate is 17 inch X 17 inch for the 6 inch thimble, and 19 inch X 19 inch for the 8 inch thimble.

Complete installation instructions accompany each unit.

Weight 10 lbs
Dimensions 1 × 1 × 1 in

Related Products

  • $555.23

    Insul-Flue; 6in Cover Assembly Only

  • $637.95

    Insul-Flue; 6in Thimble Only (no cover assembly)

  • $1,095.07

    Insul-Flue; 8in Cover Assembly Only








    *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

    NOW GIVE US A CALL AND SPEAK WITH ONE OF OUR TECHS

    866-941-5112