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converting from wood to gas - vent question

Post in 'It's a Gas!' started by steve113, Mar 26, 2011.

  1. steve113

    steve113 New Member

    Joined:
    Mar 26, 2011
    Messages:
    3
    Loc:
    Eastern MA
    Hello,

    We had a wood stove insert in an existing fireplace. This fireplace had a brick chimney that was falling away frm the house so was replaced with a class A 6" stovepipe with a wood chase built around it about 5 years ago. (chimney was on exterior wall) Worked great for the wood stove set up.

    We've decided to switch from wood to gas. Main reasons are we need a faster source of heat for the room and less work involved now that we have kids and a busier schedule. I sold the insert a few weeks ago and now are on to selection agas unit.

    The problem we're running into is we're told the 6" stove pipe is not big enough to run the 2 3" vents for direct vent gas stove. The local fireplace store had no other options for us as they only sell direct venting units.

    I have been told a B vent may work but also know they are not as efficient.

    Does anyone have a recommendation? We are open to having a gas stove on the hearth instead of an insert. I don't want to pull out the stove pipe or chase but find something that works using it. It was expensive to have installed/repaired so we'd like to salvage it for the gas venting. Plus a future homeowner would have the option of converting back to wood if they so chose.

    Open to suggestions.

    thanks!

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  2. DAKSY

    DAKSY Patriot Guard Rider Staff Member

    Joined:
    Dec 2, 2008
    Messages:
    4,944
    Loc:
    Averill Park, NY, on Burden Lake II...
    If you're locked into a gas insert you may be SOL, but if you can use a DV stove,
    you just might be able to run a single 4" exhaust up inside your liner
    & use the space remaining in the SS liner for the combustion air.
    The trick will be connecting the DV to the liner with the adapter kits that
    are available on the market.
    There are masonry adapters & Class A adapters & one of them may be possible to
    use SAFELY in your situation. This will be a pro install & NOT a DIYer...
  3. steve113

    steve113 New Member

    Joined:
    Mar 26, 2011
    Messages:
    3
    Loc:
    Eastern MA
    thanks - will talk to the retail store about stoves they have that may work. I was looking at the Hearthstone Stowe DV so want to see if they can set that up to work. Definitely not doing this project ourselves. Plan on paying a pro for the work - need to pass all inspections and have this vented correctly.

    Thanks!
  4. jtp10181

    jtp10181 Minister of Fire

    Joined:
    Feb 26, 2007
    Messages:
    3,724
    Loc:
    Madison, WI
    Many direct vent inserts are approved for a "stubby" intake liner as well. The intake could be slightly ovalized just as it enters the 6" Class A and then end. It will draw air down the old flue around the 3" exhaust liner. Just needs to be sealed up well top and bottom so it does not draw room air.
  5. mattrsvr

    mattrsvr New Member

    Joined:
    Nov 21, 2009
    Messages:
    4
    Loc:
    se mass
    Hi Steve, I am a licenced Gasfitter and NFI certified installer on Cape Cod and could certainly help you out if need be. Matt 508 775 7593
  6. Install fire 1

    Install fire 1 Member

    Joined:
    Dec 5, 2010
    Messages:
    159
    Loc:
    Canada.
    If the 6" wood chimney is a straight shot without any offsets, the 2 3"liners will go down with some patients.
  7. Fsappo

    Fsappo New Member

    Joined:
    Apr 9, 2008
    Messages:
    3,551
    Loc:
    Central NY
    Not if they are patients from a mental hospital. Those guys have no patience.
    On a short run, we have done it. pull em both thru at the same time, nice and slow
  8. steve113

    steve113 New Member

    Joined:
    Mar 26, 2011
    Messages:
    3
    Loc:
    Eastern MA
    Hi all,

    thanks for the feedback. So far I have vistited one store that primarily carries DV. They only had one DV stove from Hearthstone that was tested for using the class A pipe with the 4" inside it (I believe called co-axial). According to this dealer this can only be done and approved if the stove was specifically tested and approved in the state of Mass. They do have a natural vent Hearthstone stove (B vent) that would work but I don't like the style a whole lot plus want a DV if we can do that.

    I would love to fit the 3" intake and outtake vents into the 6" but this particular store said it could not be done. If it can be done I would get what we originally wanted (gas insert) and be home free. I'll be visiting another store this weekend to look at a Jotul (GF 300 Allagash)stove that comes in both the BV and DV.

    thanks
    Steve
  9. Fsappo

    Fsappo New Member

    Joined:
    Apr 9, 2008
    Messages:
    3,551
    Loc:
    Central NY
    If you want to see if it will fit, go buy some cheap 3" dryer vent, duct tape them together, rig up a pulling system and try to get them down the chimney
  10. Ironhorse74

    Ironhorse74 Member

    Joined:
    Oct 24, 2009
    Messages:
    205
    Loc:
    The Great Pacific North Wet
    There are a few gas inserts that are approved to just stub the intake.

    Brad

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