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Hearthstone B vent to 6" metalbestos flue...QUESTION ANSWERED

Post in 'It's a Gas!' started by abaton6, Jan 6, 2011.

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  1. abaton6

    abaton6 Member

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    Helllo,

    I'm getting rid of my coal stove, which is hooked up to a 6" metalbestos flue. I picked up a Hearthstone B vent gas stove. I was wondering if I could hook it up the 4" fluepipe that came with the stove, to the 6" metalbestos flue? Do I need the doulewalled B vent pipe outside? And if so, why?

    Thanx
    KGB

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  2. jtp10181

    jtp10181 Minister of Fire

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    Read the instructions for the stove, it will specify which types of venting are allowed. If its not a "Type B" gas vent, then you should not connect to it.

    This is from the manual for the Tuscon BV stove. First one I found on thier site that was B-Vent

    Normally Aspirating Chimneys
    The Tucson is a highly efficient gas heater. With
    operating efficiency as high as 82%, most heat
    output is retained within the living space, with
    minimal heat leaving the room via the chimney.
    However, some heat is required in all chimneys in
    order to establish and maintain a draft. Since most
    of the heat is retained in the living space with
    minimal heat entering the chimney, it is imperative
    that the chimney/venting system be properly sized
    and installed in order to establish and maintain the
    draft required for the unit to function.
    The Tucson must be properly connected to a 4" (102
    mm) diameter type B-1 vent which is constructed
    and installed in accordance with NFPA54 and
    NFPA211. Single wall vent pipe may be used within
    the same room as the Tucson so long as adequate
    (6" or 152 mm) clearance is maintained from the
    single wall pipe to combustible surfaces. The single
    wall vent pipe must connect to double-wall type B-1
    vent from thereon. The minimum clearance from
    type B-1 vent to combustibles is 1"(25 mm).

    http://www.hearthstonestoves.com/assets/files/document_library/Tucson8720Manual.pdf
    Page 14
  3. DAKSY

    DAKSY Patriot Guard Rider Staff Member

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    I'm thinkin that you can run B-vent to the Class A & then run a 4" flex,
    INSIDE the Class A, & then to the cap.
    You will hafta find a B-vent to Class A adapter & a B-vent to Class A cap.
    I've worked on B-vents that were run thru masonry chimneys, so the
    required parts for Class A adapting must be out there...
  4. Wood Heat Stoves

    Wood Heat Stoves Minister of Fire

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    if you have 6" clearance, just run 4" single wall from the stove, up thru the class a
    alot cheaper than b-vent
  5. abaton6

    abaton6 Member

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    FYI ... Spoke to my selkirk rep today. What they suggested was to run the 4" single wall up to the metalbestos flue. and attach with a reducer. The metalbestos flue will work well with the gas stove, as long as the rise isn't too high. I only have a 10' rise, so looks like I'm golden.
  6. jtp10181

    jtp10181 Minister of Fire

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    Make sure you have a good CO monitor, and if the stove randomly shuts down by itself, its not broken, its just the spill switch.

    Did no one read this part?

    However, some heat is required in all chimneys in
    order to establish and maintain a draft. Since most
    of the heat is retained in the living space with
    minimal heat entering the chimney, it is imperative
    that the chimney/venting system be properly sized
    and installed in order to establish and maintain the
    draft required for the unit to function.


    I was not thinking of the old flue as a Class A in my original post, so I think Daksy's idea would be the least expensive. You should have a 4" liner running through the 6" flue according to the instructions. Although you could also use the single wall before the liner if you meet the clearances.
  7. Wood Heat Stoves

    Wood Heat Stoves Minister of Fire

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    fail!

    pipe rep knows your stove? no way


    "can be connected to an existing, properly constructed masonry or prefabricated chimney so long as the type B-1 vent is extended through the entire length of the chimney. "
  8. jtp10181

    jtp10181 Minister of Fire

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    If he has the Tuscon... he never even said. That was just my best guess.

    But, I would also guess all of the Hearthstone B-Vent manuals have the same language in them.

    And now... we are back to what I said in the first place. If its not type B venting, don't connect to it.
  9. abaton6

    abaton6 Member

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    Thanx for all your helpful comments here. I know you all have my safety in mind.

    The stove is a b vent. The selkirk rep was well aware of this. I would think he knows what he is talking about. The thinking here is that the 6" dia flue will not stay warm enough to produce a good draft...? So the installation of the 4"flex flue inside the 6' will help do this. I did ask about this, and was told that, with the 6" only being 10', the flue will stay warm enough. I attached a pic of the stove.

    I haven't hooked it up yet because I'm still burning up the last of my coal in the "chubby" stove. I have it up for sale on craigslist, but no firm bites yet.

    When I get the Hearthstone going, I will have a CO alarm in the room, and also in our bedroom. Someone was killed here in Vermont las week, due to a "propane apliance" leaking CO. I appreciate all of the input here, and will keep a close eye on things. keep the comments coming, good thread.

    Y'all burn safe

    KGBrown
    Vermont

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  10. jtp10181

    jtp10181 Minister of Fire

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    Not all B-Vent appliances are the same, some might be OK to dump into the 6" flue. The Hearthstone specifically says not to. If you want to ignore the engineers and UL listing then be my guest. Just don't come back here with problems later until it is properly installed.
  11. Wood Heat Stoves

    Wood Heat Stoves Minister of Fire

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