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Thread: clearances

  1. #1
    Join Date
    Aug 2005
    Location
    iowa
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    1,649

    clearances

    hey guys i need a little help.

    what is the exact clearances from combustible material for single wall vent pipe, double wall and triple wall.

    what is the correct way to fun a chimney/flue through a ceiling? any links or info otherwise will be appreciated!

    this is all for a wood burning stove.

    thanks in advance

    jeep

  2. #2
    Join Date
    Aug 2004
    Location
    S.E. Pa
    Posts
    6,290

    Exclamation

    That's kinda like asking how to install a furnace. There's a lot more to it than can be discussed or taught over this forum. Get an NFI Certified Wood pro to assist you onsite.

  3. #3
    Join Date
    Aug 2005
    Location
    iowa
    Posts
    1,649
    well its really more like asking how to run a flue on a gas furnace.

    but anyway, i was asked by a friend about the installation on his wood stove in his new to him house. he so far has been unable to get anyone to come out and look at it. basically nobody wants to look at it unless he is buying a new stove or have sold him a stove recently.

    i know the clearances are not correct for the stove itself but so far have been unable to find any exact info on the flue/chimney.

    it is single wall pipe straight up and it changes to double wall where it goes through the cieling. their is little to no clearance from combustibles for the double wall. i was thinking that the clearance needed to be more like 8" for the double wall? the single wall is within 12" of the cieling.

    we live in a fairly rural area and the outdoor woodburning boilers are more common, so it seems like it is hard to find anyone that knows what they are doing.

    jeep

  4. #4
    Join Date
    May 2005
    Location
    Madison, WI
    Posts
    1,078
    Single wall connector pipe is only allowed in the room with the stove, it cannot penetrate walls or ceilings. Clearance to combustibles for single wall is 18"

    You need to clarify on the double wall pipe, there is double wall connector pipe, usually it just have a small air gap between the inner and outer wall. There is also double wall UL103HT (aka Class A) pipe which would normally have an approx 1" insulation wrap between the pipe walls.

    Double wall connector pipe that I have used is 6" CTC, this is for duravent DVL. Other brands could have their own rating, but most of what I have seen is 6". Double wall connector pipe also cannot penetrate ceilings or walls, it can only be used within the room of the stove to connect to the actual flue.

    Class A pipe can be double wall or triple wall, there can also be air cooled double or triple wall pipe which is not "Class A" and might just carry the UL103 listing without the "HT" designation. Typically any of this kind of pipe has a 2" CTC

    The ceiling penetration is usually done with a support box, or a firestop thimble. If it is not a support box, there should be another method of support in the system such as an adjustable roof support (does not have to be on the roof though). The Class A pipe is what penetrates through the ceiling, though a support box or firestop thimble. It must come into the room enough to allow proper clearances for the connector pipe system.

  5. #5
    Join Date
    Aug 2005
    Location
    iowa
    Posts
    1,649
    thank you

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