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    DuraFlex Chimney Liners

    The chimney liner protects the chimney's masonry from the intense heat produced by wood-burning fireplaces and appliances as well as from the products of combustion. Codes for all modern chimneys require liners for safety. These flexible liners come in various diameters and lengths so that you can find the right product to line an older chimney for the first time or re-line a chimney that requires an updated liner. They are flexible to make insertion easy, even when chimney offsets may make a rigid liner less practical.
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    9 Questions & 9 Answers
    from Dartmouth, Mass asked:
    February 29, 2016
    Can this be used for a home heating furnace?
    1 Answers
    This is not used as HVAC ducting nor is this listed for that application. In addition, this would be a very expensive option when compared to HVAC ducting.
    Will M.
    on March 1, 2016

    from Rockford, IL asked:
    November 8, 2015
    I have an existing brick chimney that is not being used and I want to put a wood burning stove in my house. Can I use a DuraFlex chimney liner for the wood burning stove with the existing brick chimney?
    1 Answers
    You can indeed use a Duraflex liner within the brick chimney to vent the stove. Typical setup is to run standard single wall black stovepipe into the chimney opening and up out of sight before converting over to the flex liner above the lintel area.
    on November 9, 2015

    from Indian Lake, NY asked:
    September 17, 2014
    I have a wood stove in my cellar connected to a chimney with cracks in the tile. It is 19 1/2 feet from the top of the chimney tile to the bottom of the hole in the cellar wall where the stove pipe goes into the wall. The tile inside diameter is 6 5/8 x 11 inches so I am considering a Duraflex 6 inch liner and "T" to make the chimney safe. My questions are: 1. What bears the weight of 20 feet of SS 6" liner after it is placed in side the old chimney tile? 2. What is the outside diameter of the "T" connector ?
    1 Answers
    In most cases, the weight of the liner is supported by a metal top plate. The tee leg that slides into the chimney thimble can support some weight, but not much. There is a bottom support kit offered by the manufacturer, but most chimneys offer no access to the tee mounting location and such a plate cannot be installed. For additional top support, a pair of flat steel bars can be laid across the top flue tile, prior to installing the top support plate. This will prevent any sagging over time. The outside diameter of the tee is 6 1/8 inches.
    on September 17, 2014

    from East Berne, NY asked:
    May 16, 2014
    I am looking to install a wood burning insert into my fireplace. Where the flue empties into the stack, the opening is slightly less than 6 inches. Is it ok to compress the liner slightly to fit through this space?
    1 Answers
    You can indeed ovalize the liner slightly to allow it to pass through the narrower damper area. It is fairly easy to ovalize the liner by up to 1/2 of an inch. Further ovalization will require greater effort.
    Collin C. - NFI Master Hearth Professional
    on May 16, 2014

    from Reno, Nevada asked:
    September 24, 2013
    Do the three (3") intake air tubes need to be piped to the top of the chimney if there is adequate air in the chamber where the insert is installed? This is for product # dv35in.
    1 Answers
    No. As long as the exhaust liner is piped to the chimney termination, the intake air tube can be routed just above the damper and can pull air from the chimney flue.
    Collin C. - NFI Master Hearth Professional
    on September 24, 2013

    from Apple Valley, MN asked:
    July 8, 2013
    What's the best product to clean my 6" liner about a year ago?
    1 Answers
    One of our standard 6" round brushes would do the trick. For example, our Schaefer round brush is perfect for this application.
    Kevin E. - Fireplace Specialist
    on July 9, 2013

    Randy Humphries
    from Chico, CA asked:
    November 27, 2012
    I have a traditional fireplace, brick chimney, smoke chamber and flue. How do I connect the flex liner to the bottom end of the brick chimney above the fireplace?
    1 Answers
    If you are simply relining the chimney for continued use as an open faced model, you would need to use a bottom support plate and support leg system. An example of the bottom plate is the HomeSaver Pro 18 inch x 18 inch Top/Bottom Plate for 5.5- or 6 inch Chimney Liner. The plate would be cut to fit the base of your flue and held in position with the HomeSaver Universal Size Bottom Plate Leg Support System. Another option would be to cut rebar to length and attach it to the base of the plate using brackets made of U-channel.
    Collin C. - NFI Master Hearth Professional
    on November 28, 2012

    from Brownwood, TX asked:
    November 13, 2012
    I am trying to re-install my wood burning insert into an existing fireplace and am interested in using the Duraflex system. However, I am unsure of exactly what I need to order. I need to connect to the stove via 8" exhaust, flex up to the top of the firebox and terminate with an anchor plate. I would need about 4 feet of liner. My questions are: How to connect the Duraflex to the stove? How to terminate Duraflex to the anchor plate?
    1 Answers
    In order to make the sort of connection you require, I would recommend using our Duraliner chimney system, rather than Duraflex. Duraliner will have an anchor plate to attach to the stove, as well as a slip connector assembly that is designed to attach to a chimney anchor plate atop existing masonry. The major components are the DuraVent DuraLiner Round Stove Connector for Dura liner 8 inch Pipe as well as the DuraVent DuraLiner 60 inch Round Flex Reline Pipe. Lastly, you would need to use the DuraVent DuraLiner Slip Connector and Hanger for Dura liner 8 inch Pipe. You will notice that the length of Duraliner covers 60 inches; however, this liner can be collapsed an manipulated to fit into the 48-inch space you have. The slip connector can also be cut to shorter length. These parts, in conjunction with your masonry anchor plate, should allow you to complete the installation.
    Collin C. - NFI Master Hearth Professional
    on November 14, 2012

    November 9, 2012
    I have a coal burning stove (Harman) that is quite efficient. The chimney was installed with liners but it is 8” x 16” and originally for a wood stove. The Harman coal stove does not heat the chimney enough to produce enough draft. I have to install pipe inside the chimney each year to get the proper draft. Is your stainless steel liner rated for coal exhaust?
    1 Answers
    The 316-alloy DuraFlex or HomeSaver chimney liner will be adequate for your coal stove, and we do recommend that you insulate your liner. Please see the following items as recommendations: Chimney Liner Component Kit 1 Chimney Liner Component Kit 2 Chimney Liner Component Kit 3 Please let us know if you have any additional questions.
    on November 9, 2012

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