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  1. #1
    Join Date
    Feb 2013
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    Gas Fireplace venting Question

    I'm working on putting a new natural gas fireplace into an existing firebox. I'm lucky because the gas line was extremely close, the firebox was very large, plus it has a 6" flexible vent which runs up the old chimney. The vertical rise is roughly 25' and it's nearly a perfect straight shot up to the top.

    So here's my question. The manufacture indicates I need a 4"/7" venting system (generic double wall config), but I'm guessing I could simple run a 4" down the existing 6" and I'd be safe. I'm a little nervous that I could starve the unit of fresh air, but it's such a low BTU I don't see how this would be a problem. I know the exhaust flue will be the right side so I'm not creating a dangerous situation.

    I'm not sure if I've given enough information or not, but I'd be curious to get thoughts.


    Here are more details.
    Natural Gas
    Max input = 18,000 btu
    Max output = 11,500 btu
    615 aq inch viewing area

  2. #2
    Join Date
    Aug 2004
    S.E. Pa
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    You're not going to like this but step away from the fireplace before you blow yourself up. I'm not kidding. From what you've said, you don't have a clue what you're doing and really need to hire a hearth pro to plan and install this for you.

    What is the make and model of this fireplace?

    Sorry man,

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