web analytics
Shape of a brick chimney - Forno Bravo Forum: The Wood-Fired Oven Community

Announcement

Collapse

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!

Forno Bravo
See more
See less

Shape of a brick chimney

Collapse
X
  • Filter
  • Time
  • Show
Clear All
new posts

  • Shape of a brick chimney

    I am at the final stages of my oven build. I have now started with my chimney which is a simple brick chimney that sits on top of the front arch.
    See picture.

    So far the chimney is about 30cm high and it was recommended to me (from a non oven builder ph..) to make the top of the chimney narrower towards the end to increase the “upwards draft”.

    Is that true?

    Also, the inside of the chimney is very rough due to different sized bricks and my lack of brick laying skills. Does the rough surface have a negative effect on draft ability of the chimney? Is it worth rendering the inside of the chimney with fire mortar?

    Any thoughts are very much appreciated

  • #2
    Re: Shape of a brick chimney

    Also, the inside of the chimney is very rough due to different sized bricks and my lack of brick laying skills. Does the rough surface have a negative effect on draft ability of the chimney? Is it worth rendering the inside of the chimney with fire mortar?
    I don't think it's worth messing with the inside of the chimney. The folks who build masonry heaters have largely concluded that a smooth transition isn't worth cutting a bunch of bricks. On the other hand, the rumford fireplace folks think a smooth curve is essential. It's a matter of opinion: mine is that smoke is a gas and will flow where it flows despite mini-turbulence caused by roughness in your smoke funnel.
    My geodesic oven project: part 1, part 2

    Comment


    • #3
      Re: Shape of a brick chimney

      @DMUN.

      Kudos for the excellent quality of your work and the documentation to help put it out there for the rest of us to learn from and enjoy. I especially enjoyed the geodesic dome and your comments about it. I was thinking of trying that, but have decided to go conventional. Of all the things you have posted, this comment on smoke flow in a smooth vs rough chimney is the only one I might offer a second perspective on.

      People who design pipes and airplanes spend a lot of time reducing the rough edges because this can have a surprising effect on the flow of fluids (gas and liquid). It will never be as important as having the proper size, but could make the difference between 'almost big enough' and 'big enough'.

      bd

      Comment

      Working...
      X