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    Chimney Pipe Q&A with the NFI Certified Specialists

    * Please Note: All customer questions are answered by our NFI Certified Specialists free of charge!
    18 Questions & 18 Answers
    Vic M
    from Nampa, ID asked:
    September 13, 2021
    Do you have available L series pipe that was from Martin Hearth or Lennox hearth in 11" inside and 13" outside?
    1 Answer
    We apologize, but we do not have any L series pipe available.   These parts have been discontinued by the manufacturer. 
    Submitted by: Tyler M. - NFI Master Hearth Professional on September 13, 2021

    Robert M.
    from Swan Lake, MT asked:
    August 5, 2021
    What diameter should the female dimension of a steel coupling flange be to receive the male end of a 6 inch and/or an 8-inch stove pipe?
    1 Answer
    If you are referring to the flue connection on a wood stove, there is no general answer we would be able to provide. I will note, however, that most stovepipe manufacturers will offer a stovepipe to appliance adapter to provide the proper male end down connection by accounting for slight differences between the female stove flue connection and the male connection of the stovepipe.
    Submitted by: Will M. on August 5, 2021

    from Winnipeg Manitoba, CAN asked:
    July 26, 2021

    I tried to remove some old vent pipes that went into my basement. White, sandy material came out from the vent pipe. Is this material harmful?

    1 Answer
    That material should just be a silica sand and is not harmful.
    Submitted by: Aaron D. on July 26, 2021

    Dwayne R.
    from Winter Park, FL asked:
    June 21, 2021
    I am looking for a 10 x 15 flue mount chimney cap. Where might I find that?
    1 Answer
    The Draft King 12 in. x 16 in. Black Painted Galvanized Steel Single Flue Chimney Cover is available that would fit that size of flue tile.
    Submitted by: Aaron D. on June 21, 2021

    Stephen F.
    from Berkeley Springs, WV asked:
    June 8, 2021
    I need a super vent chimney pipe to reduce from 8" to 6". Where can I buy one?
    1 Answer
    Unfortunately, Supervent does not have an adapter to go from 8" - 6".
    Submitted by: Aaron D. on June 9, 2021

    Karl G.
    from Mont Vernon, NH asked:
    October 21, 2020
    Do you sell a reducer for an insulated pipe from 7 inches to 6 inches?
    1 Answer
    No, our only such reducers are for the single-wall black stovepipe.
    Submitted by: Tyler M. - NFI Master Hearth Professional on October 22, 2020

    William R.
    from Virginia asked:
    March 20, 2020
    Do you sell stainless steel chimney pipe?
    1 Answer
    Yes, we have several brands of chimney pipe. Some are used with specific units.
    Submitted by: Kathy O. on March 20, 2020

    January 4, 2020

    I want to remove an old fireplace and install a zero clearance fireplace. There is currently an 8" chimney/flue exiting the chase above the roof. Can a fireplace that requires a 6" flue be installed with a flexliner 6" inside the existing 8" pipe? 

    1 Answer
    No, you will need to connect all-new pipe that is compatible with the new fireplace model, as this is the only way to get a proper, listed installation. The diameter/model of the chimney pipe needed will be determined by the model itself.
    Submitted by: Tyler M. - NFI Master Hearth Professional on January 6, 2020

    Dennis Busiere
    from Troy, IL asked:
    December 19, 2019
    Are 8 inch black sheet metal to oval wood stove adapters still available?
    1 Answer
    We have an oval to round adapter in 8" but it isn't a guarantee that it will fit your oval.  You can click here to view the item.
    Submitted by: Kathy O. on December 20, 2019

    from Sacramento, CA asked:
    November 29, 2019
    I have a zero clearance wood burning fireplace and would like to add a fireplace insert into it. Would I need to directly connect the chimney pipe to the insert or would the existing exhaust into the zero clearance be sufficient?
    1 Answer
    A continuous run of 6" flexible stainless steel chimney liner will need to run from the insert flue connection to the top of the chimney. 
    Submitted by: Will M. on November 29, 2019

    Bruce F.
    from West Tisbury, MA asked:
    November 29, 2019
    Do you sell a flue paint sealer?

    1 Answer
    No, we do not offer this product. 
    Submitted by: Will M. on November 29, 2019

    from Berlin, NJ asked:
    November 15, 2019
    I have a 42" TemTex woodburning fireplace and need the flue pipe to install, do you have this?
    1 Answer
    No, we apologize, but we do not have any chimney parts for Temtex fireplaces.
    Submitted by: Owen O. on November 15, 2019

    from Baldwin, WI asked:
    November 14, 2019

    I am looking at the WRT4542 for my 1200 sq. ft. home. My question is, will the damper in the stove leak cold air when not fired? Also, will a vent kit do the same? Additionally, do I need a fresh air kit?

    1 Answer
    The WRT4542 fireplace has a fireplace built into the top of the unit and this will do a great job preventing too much cold air intrusion down the flue and into the house. You could also add glass doors to this unit to further mitigate any such cold air issues.  There is no fresh air kit needed for the chimney, as the pipe itself is air-cooled with a 15-inch outside diameter pipe (it has a 12-3/8-inch inside diameter). We would recommend a fresh air kit to be connected to the side of the fireplace if it will be installed near an exterior wall or above crawlspace.
    Submitted by: Tyler M. - NFI Master Hearth Professional on November 14, 2019

    from Camp Wood, TX asked:
    October 18, 2019

    My ceiling is 10 ft high. What do I need for support in the chase?

    1 Answer
    On the vertical rise within the chase, it is recommended to have wall straps for support every 8 feet.
    Submitted by: Tyler M. - NFI Master Hearth Professional on October 18, 2019

    Ron Brock
    from Oroville,CA asked:
    February 2, 2018
    How do i get an airtight seal from my insert to chimney without installing pipe all the way up the existing brick chimney?
    1 Answer
    For an insert to work at optimal efficiency, you would need to run the liner all the way to the top. That is also the only way you can have a sealed collar plate with rain cap at the top of chimney.
    Submitted by: Kelsey C. on February 5, 2018

    from Hickory, NC asked:
    November 16, 2013
    When using an oval liner, should the adapter be sized so that the liner fits over the adapter or inside of the adapter?
    1 Answer
    When using sleeves and adapters, the male end of the liner should always be facing back towards the unit. This allows condensation to run back inside of the appliance as opposed to down the exterior of the liner itself.
    Submitted by: Chris on November 17, 2013

    from Hamilton asked:
    September 9, 2013
    How long does a gas liner last?
    1 Answer
    While longevity will depend on the amount or humidity in the flue gases, the typical liner can last for 20 to 25 years under normal conditions. In extreme circumstances where high humidity is present, the life expectancy can be cut in half.
    Submitted by: Collin C. - NFI Master Hearth Professional on September 10, 2013

    from Indianapolis, IN asked:
    July 8, 2013
    Should inner liner go inside outlet on box or should it be outside?
    1 Answer
    The general rule of thumb is for vent pipe to be installed male end down. So, the liner would go inside the flue outlet. Of course, most factory boxes require specific brands of pipe that feature locking tabs and ensure a proper fit/connection.
    Submitted by: Kevin E. - Fireplace Specialist on July 9, 2013

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