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Chimney Question - Forno Bravo Forum: The Wood-Fired Oven Community



New Forno Bravo Forum Feature

Forno Bravo Forum Community,

You will notice a new forum at the top of the main page called, "Ask Me Anything". This forum will be used for live one hour "Ask Me Anything" (AMA) sessions hosted by people who are knowledgeable in different areas pertaining to wood fired ovens. How it works:
- Each AMA will have a "sticky" thread where the community can post questions they would like answered during the live session. This will allow everyone to participate even if you can't be online for the live session. These questions will not be answered by the host until the live AMA; if you need an answer quickly, you should post it in the appropriate Forum area for the community to respond.
- Another thread will be posted for the live AMA. Registered users who are logged in during the live session can interact with the host by asking questions and receiving responses.
- The live thread will remain in the AMA forum to view after the session.

To kick off our AMA feature, we have invited author, chef and master bread maker and host of Pizza Quest, Peter Reinhart, to be our first host! Peter will be in the Forum on Monday, February 15th, from 7:00 - 8:00 pm EST. If you are unable to be online during the live session, you can post your questions in the sticky post. Peter will answer those questions during the live session on February 15th. You can view Peter's answers to your questions as well as what happened during the live session in the session thread.

We hope you enjoy this new feature! Please let us know if there is a topic that you'd like to have as an AMA and we'll look for a host!

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Chimney Question

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  • Chimney Question

    Hi everybody,
    I am building the Pompeii oven (I think) and am trying to get the chimney/vent right. My interior oven dimmension is 36". Door is 19" wide and 12" tall. My chimney opening I have created in the entrance arch is 10" by 6" square. The question I have I guess is; Do I need to "flare" the base of the chimney (so it constricts on the way up)?. Also, what height should I be shooting for in order to ensure I get good draw. Lastley, does my flue liner need to continue to the top of my chimney stack or can I switch to regular brick at the top.

    I found one 10" by 6" liner that is about 12" tall. I was planning on building a base from fire bricks with high temp mortar on top of my entrance arch to create a flat location for the liner to rest. Then after setting my liner on the new "shelf" I plan to wrap it with ceramic blanket. Then I was going to continue to enclose the flue/ceramic blanket with ornamental red brick splits to hide the ceramic blanket, thus giving the flue room to expand and contract as needed within the structure without popping off the pretty bricks. Is this standard operating procedure?

    Any help or advice would be greatly appreciated. Thanks All!

  • #2
    Re: Chimney Question

    Do I need to "flare" the base of the chimney (so it constricts on the way up)?
    I think the best practice is to have an opening in your entry about twice the area of the flue opening. Having no transition is a potential problem of smoke coming out. My smoke funnel may be a bit excessive: with a two story chimney it could probably contract at the bottom and still draw fine.
    My geodesic oven project: part 1, part 2