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  #101  
Old 03-22-2013, 07:06 PM
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Default Re: K79 Oven Build

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Originally Posted by Tscarborough View Post
Shuboyje, you are building a Neapolitan vent aren't you?
Yes and no. Yes my second oven has a Neapolitan vent in that it vents back over the dome and goes vertical once it is at the center, but the landing area varies greatly from a Neapolitan oven. In a Neapolitan oven they have essentially zero landing because the entire front of the oven is uninsulated. My oven is insulated fully on the front and around the vent, so I have a 6" landing, the same depth as the insulation.

My first oven had a welded metal vent that was straight up. It was still only 6" deep. Any future ovens I build for home use will have a setup similar to this.

As for "hacking" the metal, maybe my profession(sheet metal worker) has me jaded, but I would think anyone building a brick dome could cut a couple inches of metal and drill some new holes for the tapcons.

My context probably jades my opinion on this, but it is still worth mentioning. My context being that I build low dome small doored Neapolitan inspired pizza ovens. My current oven is 42" with a 18x8 arched entry. The simple task of building a fire in the center of the oven would be impossible if I had landings as long as you guys build, let along accessing the oven to cook 3 pizzas at a time in under 60 seconds.
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  #102  
Old 03-22-2013, 07:45 PM
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Default Re: K79 Oven Build

I agree. The shallower the entry is the easier it is to work the oven, but you must make sure it is adequately flued.
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  #103  
Old 03-25-2013, 08:26 AM
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Default Re: K79 Oven Build

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I agree. The shallower the entry is the easier it is to work the oven, but you must make sure it is adequately flued.
Is it possible to "over" flue?
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  #104  
Old 03-25-2013, 08:33 AM
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Default Re: K79 Oven Build

Some progress. I can't wait for this weather to break !

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  #105  
Old 03-25-2013, 02:24 PM
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Default Re: K79 Oven Build

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Is it possible to "over" flue?
With a front flued oven I don't believe it is. The flue will also suck air from the front and the fire only takes as much air as it needs.
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  #106  
Old 03-25-2013, 04:50 PM
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Default Re: K79 Oven Build

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Some progress. I can't wait for this weather to break !

Looking good! Are you getting rid of that sliver on the first course?
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  #107  
Old 03-25-2013, 04:54 PM
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With a front flued oven I don't believe it is.
I agree. An outdoor chimney doesn't function like one for an indoor FP/stove...too many dynamics outside. It's more about giving smoke a place to go besides the front opening.
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  #108  
Old 03-26-2013, 06:37 AM
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Looking good! Are you getting rid of that sliver on the first course?
Yes I'll be getting rid of that. I wiped out all of the firebrick at my local yard. Waiting on more brick
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  #109  
Old 03-26-2013, 06:54 AM
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Default Re: K79 Oven Build

Ok all, I'm hoping to resolve my chimney/vent/flue issues today so I can finalize my foundation pad and block wall design.

I understand that 15% of my oven opening is the minimum size I want for my flue. My oven opening is 208sqin. Therefore I need a minimum of 31.2sqin of vent opening. A 6" ss chimney only gives me 28.27sqin. A 7" ss chimney gives me 38.48sqin. So I can go with either a 7" or an 8". Now I'm trying to figure out what my anchor plate is going to rest on. I've been looking at Ken524's design and this is where I get a little confused (unless I'm trying to go by the books too much).

Ken's oven is 42" (btw, thanks for letting me use your oven as a guinea pig Ken)
In view one (and I'm assuming some numbers here but I think I'm close) Ken's flue vent starts 9 bricks wide and looks to be 1/2 brick in width. This gives a flue vent area of 83.25sqin. at the bottom. It then tapers to 5 bricks wide at the top giving about 46.25 sqin (view 2). Now in View 3 Ken builds a "landing" for his anchor plate and now makes the opening only 4 bricks wide giving about 37sqin of flue vent for his 8" ss chimney which can handle 50.26sqin. (view 4).

This is what confuses me. Shouldn't the opening under his anchor plate be 50.26 sqin to maximize the effectiveness of his 8" chimney. Since a 7" chimney can handle just over 38sqin would that have been a better fit????

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  #110  
Old 03-26-2013, 07:02 AM
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Default Re: K79 Oven Build

Actually a bit of restriction can be a good thing because it creates a Venturi effect and increases the velocity of the flow in that area.
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