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Old 08-25-2009, 01:35 PM
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Default Rear Chiminey

I don't see anything on "rear chimneys". I want my oven to look like the one in the Frorno Bravo site (attached pic). It appears to have the chimney in the rear. How do I achieve that look?
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Old 08-25-2009, 01:53 PM
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Default Re: Rear Chiminey

No, you don't want that.

Think of it as a "vent" not as a conventional chimney. It is situated outside of the oven over the entryway and its function is to divert hot gasses away from your face as you operate the oven.

The thermodynamics of a pompeii oven are such that the hot gasses from the fire, fed by air entering the bottom of the door, rise and exchange heat with the bricks before cooling and exiting the top part of the door. (This is why the door height to oven height ration of 0.63 is important.)

If you install an internal chimney, you will create an air flow that will quite negatively affect your oven efficiency.

Last edited by Neil2; 08-25-2009 at 05:05 PM.
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Old 08-25-2009, 02:00 PM
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Default Re: Rear Chiminey

Ok, so how do I achieve the look in the photo?
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Old 08-25-2009, 02:05 PM
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Default Re: Rear Chiminey

That's a modular oven (i think the Forno Bravo Artigiano) uninstalled, uninsulated, with a light bulb in it for a photo op. All successful wood fired ovens have their vents in the front, over the entry.
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Old 08-25-2009, 02:24 PM
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Default Re: Rear Chiminey

Ok, I was afraid that was the answer. No problem, how about this one.
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Old 08-25-2009, 02:28 PM
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Default Re: Rear Chiminey

"No problem, how about this one."

That is a style that also has a vent in the front. The flue portion is then curved over the outside then vertical at the top of the dome. If you look closely at the top front, you can see a "bulge" where the flue goes.
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Old 08-25-2009, 02:52 PM
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Default Re: Rear Chiminey

Gotcha, thanks.
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Old 08-25-2009, 04:05 PM
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Default Re: Rear Chiminey

Diverting the chimney back over the oven can definitely be done but it is important to do it right so that you have enough flow area to draw well - the curves (and potentially worse) don't help the chimney draft! Be sure to oversize the flue!

There is another issue with internal chimneys that is worth mentioning - it would greatly limit your ability to bake for the hot air would simply go up the chimney (and let cold air down!)

Jay
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Old 08-25-2009, 06:29 PM
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Default Re: Rear Chiminey

There are some posts on squirell tale ovens that route the smoke from the front to the back. Also google will show you some others.

http://www.fornobravo.com/forum/f9/squirrely-4416.html (Squirrely?)

MHA News - 2006 Meeting - Backyard Oven with Peter Moore

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Old 08-26-2009, 09:37 AM
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Default Re: Rear Chiminey

I am in the process of building pizza oven now and would like to put a fireplace next to it. Does anyone think it is possible to join the two flues and go up in between them?
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