Author Topic: (Neapolitan) Chimey and door dimensions for small WFOs  (Read 682 times)

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Offline LaLabbo

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(Neapolitan) Chimey and door dimensions for small WFOs
« on: March 23, 2016, 04:43:18 AM »
Hi guys,

can someone please give me some insights on how to scale the chimney for WFOs with a diameter from 80cm-100cm?
I would like to use a neapolitan chimney design, where the chimney reaches over the top of the oven.

For bigger ofen there are some plans in Sub's thread. Is it a bad idea to downscale these dimensions?

Regarding the door I have the same questions.


Thanks,
Marv

Offline sub

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Re: (Neapolitan) Chimey and door dimensions for small WFOs
« Reply #1 on: March 23, 2016, 07:45:01 AM »
Hi Marv,

the chimney diameter for the  Mario Acunto Combo 1 (75cm) is 20cm, the door is 38.5cm large.

the chimney diameter for the Gianni Acunto Mod.3 palmi (80cm) is 20cm.
« Last Edit: March 23, 2016, 08:02:59 AM by sub »

Offline LaLabbo

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Re: (Neapolitan) Chimey and door dimensions for small WFOs
« Reply #2 on: March 23, 2016, 08:53:09 AM »
Thanks sub!
Do you know the height of the door?
« Last Edit: March 23, 2016, 09:19:16 AM by LaLabbo »

Offline TXCraig1

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Re: (Neapolitan) Chimey and door dimensions for small WFOs
« Reply #3 on: March 23, 2016, 09:25:15 AM »
Hi Marv,

the chimney diameter for the  Mario Acunto Combo 1 (75cm) is 20cm, the door is 38.5cm large.

the chimney diameter for the Gianni Acunto Mod.3 palmi (80cm) is 20cm.

I think 20cm is pretty standard for the chimney on all Neapolitan ovens regardless of size.

The door on my 100cm Acunto is about 44cm.
"We make great pizza, with sourdough when we can, commercial yeast when we must, but always great pizza."
Craig's Neapolitan Garage

Offline TXCraig1

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Re: (Neapolitan) Chimey and door dimensions for small WFOs
« Reply #4 on: March 23, 2016, 09:28:37 AM »
Thanks sub!
Do you know the height of the door?

It's pretty close to a semi-circle. Mine is 44.5 x 23cm.
"We make great pizza, with sourdough when we can, commercial yeast when we must, but always great pizza."
Craig's Neapolitan Garage

Offline sub

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Re: (Neapolitan) Chimey and door dimensions for small WFOs
« Reply #5 on: March 23, 2016, 09:45:36 AM »
Thanks sub!
Do you know the height of the door?

No, I don't have it.

On the Gianni Acunto 80cm the door is 44 x 22 cm

I think 20cm is pretty standard for the chimney on all Neapolitan ovens regardless of size.


The standard is 25cm dia on the 105cm models and above.

Offline TXCraig1

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Re: (Neapolitan) Chimey and door dimensions for small WFOs
« Reply #6 on: March 23, 2016, 10:22:26 AM »
The standard is 25cm dia on the 105cm models and above.

My mistake. That's what I meant. I should know that. Mine is 25cm.
"We make great pizza, with sourdough when we can, commercial yeast when we must, but always great pizza."
Craig's Neapolitan Garage

Offline TXCraig1

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Re: (Neapolitan) Chimey and door dimensions for small WFOs
« Reply #7 on: March 23, 2016, 10:26:06 AM »
I wonder if GA ovens are really 10" at the chimney as it says in this table? When mating the chimney to the flue, 10" is not the same thing as 25cm.
"We make great pizza, with sourdough when we can, commercial yeast when we must, but always great pizza."
Craig's Neapolitan Garage

Offline sub

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Re: (Neapolitan) Chimey and door dimensions for small WFOs
« Reply #8 on: March 23, 2016, 02:31:29 PM »
The installation use and maintenance manual says:

Quote
The oven is provided on the top with short single wall stainless steel collar 10 inches which serves to connect the natural draft flue system.

The flue collar at the oven top shall be connect to UL Listed Type HT Chimney System. The collar is provided with an anchor to a 10 inches standard size chimney.

Offline TXCraig1

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Re: (Neapolitan) Chimey and door dimensions for small WFOs
« Reply #9 on: March 23, 2016, 02:38:40 PM »
That would be nice. My chimney is 25cm which is enough smaller than 10" to make things more difficult.
"We make great pizza, with sourdough when we can, commercial yeast when we must, but always great pizza."
Craig's Neapolitan Garage

Offline sub

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Offline TXCraig1

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Re: (Neapolitan) Chimey and door dimensions for small WFOs
« Reply #11 on: March 23, 2016, 03:00:27 PM »
Interesting. That's a gas/combo oven.
"We make great pizza, with sourdough when we can, commercial yeast when we must, but always great pizza."
Craig's Neapolitan Garage


Offline LaLabbo

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Re: (Neapolitan) Chimey and door dimensions for small WFOs
« Reply #12 on: March 24, 2016, 09:19:07 AM »
Is there some disadvantage in building the chimney directly over the dome withe the use of a stainless steel pipe?

Offline TXCraig1

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Re: (Neapolitan) Chimey and door dimensions for small WFOs
« Reply #13 on: March 24, 2016, 09:39:31 AM »
Is there some disadvantage in building the chimney directly over the dome withe the use of a stainless steel pipe?

What do you mean by "directly over the dome?" If you mean directly into the dome, it's a huge disadvantage as that vents all the heat straight out of the oven.
"We make great pizza, with sourdough when we can, commercial yeast when we must, but always great pizza."
Craig's Neapolitan Garage

Offline LaLabbo

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Re: (Neapolitan) Chimey and door dimensions for small WFOs
« Reply #14 on: March 24, 2016, 10:27:47 AM »
Nono not directly into the dome.

I want to replace the red part with a tube, to remain the functionality of the neapolitan design

Offline TXCraig1

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Re: (Neapolitan) Chimey and door dimensions for small WFOs
« Reply #15 on: March 24, 2016, 10:33:59 AM »
I think that would work fine presuming you built the surrounding structure to funnel the exhaust into it. Also, keep in mind that the part you highlighted in red is not round and is wider than it is high, so it's bigger than if it was round. Make sure you use a big enough pipe to handle the exhaust.
"We make great pizza, with sourdough when we can, commercial yeast when we must, but always great pizza."
Craig's Neapolitan Garage

Offline LaLabbo

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Re: (Neapolitan) Chimey and door dimensions for small WFOs
« Reply #16 on: March 24, 2016, 10:42:04 AM »
Thanks,
Yeah I think the surrounding structure is really necessary. But I don't think the sizing problem matters, since the chimney is 10" there would be a bottleneck in the traditional and the pipe(>= 10") construction.

Offline TXCraig1

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Re: (Neapolitan) Chimey and door dimensions for small WFOs
« Reply #17 on: March 24, 2016, 10:50:06 AM »
In my oven (Acunto 120), the flue cross section in the dome is larger than a 10" pipe. A 10" pipe is ~78.5in^2. The flue in the dome is ~88 in^2. If the oven needs a 10" chimney, I don't think putting a 6" or 8" pipe in the dome will be sufficient. Of course none of this really matters if you put the oven outside and don't care if the face gets black.
"We make great pizza, with sourdough when we can, commercial yeast when we must, but always great pizza."
Craig's Neapolitan Garage

Offline LaLabbo

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Re: (Neapolitan) Chimey and door dimensions for small WFOs
« Reply #18 on: March 24, 2016, 11:19:34 AM »
I'm totally with you, the pipe has to be bigger than the chimney! Maybe I'll try some different pipes, starting with 10".
Will report the results

Offline LaLabbo

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Re: (Neapolitan) Chimey and door dimensions for small WFOs
« Reply #19 on: April 18, 2016, 03:02:08 AM »
So I had the first test with my oven yesterday.

I think the door  hight of 20cm is necessary as a lower door doesn't provied sufficient air supply to the fire.
So I have to make a bigger door.

Attached are some pic's of the build so far.


Insulation and outer shell follow next weekend.

« Last Edit: April 18, 2016, 03:03:41 AM by LaLabbo »

Offline LaLabbo

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Re: (Neapolitan) Chimey and door dimensions for small WFOs
« Reply #20 on: April 19, 2016, 10:35:21 AM »
So I'm going to lift the upper dome to an door higth of 20cm.

I'm thinking about the surrounding structure for the exhaust.
Since a metal shield isn't sufficient shapeable I'm thinking about using chicken wire and mortar, any thoughts on that?

I'm happy for every input.

Offline LaLabbo

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Re: (Neapolitan) Chimey and door dimensions for small WFOs
« Reply #21 on: May 25, 2016, 04:49:28 AM »
latest update:

raised the upper oven element, insulated with ceramic wool and perlite/concrete mix, also the vent is changend to a new design:

Offline LaLabbo

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Re: (Neapolitan) Chimey and door dimensions for small WFOs
« Reply #22 on: Today at 05:58:04 AM »
in progress, just a few steps to finish my oven:


 

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