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Old 02-11-2014, 04:20 AM
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Location: Denmark
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Post Chimney Insulation on WFO?

Hi all,

I'm in the planning phase of my WFO, i'm atm doing alot of excavating, about 35 tons of dirt needs to be removed to form the hole where i want my WFO to be in. 13 by 20 foot hole.

Well the question I have right now is something I find hard to locate any direct opinion about in the forum. The chimney, I'm gonna make about 6-8" and then about 40-50 " tall.

Is a normal stainless steel or just steel tube sufficient, or should there be some insulation to make the draft better ?

Its just because I calculate that I'm going to go over and above my budget, so I'd like to cut some corners somewhere - But it cannot compromise the end result

I'm living in Denmark, where the temp is not going above 30 degrease Celsius in the summer. The average temp is about 20 degrease Celsius in the summer (where I plan to use the WFO)

Hope you guys can share the knowledge and maybe help clarify for me.

EDIT: I'm using the 42" plans from this forum. with same dims etc.

Thanks.
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Last edited by Madsen; 02-11-2014 at 04:44 AM.
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Old 02-11-2014, 04:36 AM
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Default Re: Chimney Insulation on WFO?

The required diameter of the chimney depends on the volume of the oven chamber. Your planned height is about normal. Higher gives you some more draw.What kind of oven are you planning to build? Hemisphere, Barrel oval? What internal dimensions?
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Old 02-11-2014, 04:44 AM
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Default Re: Chimney Insulation on WFO?

Quote:
Originally Posted by david s View Post
The required diameter of the chimney depends on the volume of the oven chamber. Your planned height is about normal. Higher gives you some more draw.What kind of oven are you planning to build? Hemisphere, Barrel oval? What internal dimensions?
Hi David,

I just edited OP, but I'm making the pompeii 42" according to the plans on Forno Bravo.
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Old 02-11-2014, 07:27 AM
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Default Re: Chimney Insulation on WFO?

The reason that Stainless Steel is used is that it won't rust. Regular steel will probably last a long time but will begin to deteriorate slowly - but it may still outlive your oven. My chimney is stainless steel so I can't comment on how regular steel would work. I know that many on this forum recommend NOT using galvanized due to the potentially dangerous gases being burnt off by the heat.

You do NOT need to insulate the chimney. Mine is not insulated and draws perfectly.

Good luck!
Neil
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Old 02-11-2014, 07:59 AM
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Default Re: Chimney Insulation on WFO?

Galvanized steel flue will rust away relatively quickly.
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Old 02-11-2014, 09:45 AM
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Post Re: Chimney Insulation on WFO?

If your oven will be uncovered the steel chimney will definitely rust and the rust will become brick stain over time. just saying' Get some stainless, you not regret it.

Texman
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Old 02-11-2014, 11:24 AM
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Default Re: Chimney Insulation on WFO?

Thanks guys, i'm going to get a stainless steel with no insulation of any kind. That should save me some money for sure
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Old 02-11-2014, 11:52 AM
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Default Re: Chimney Insulation on WFO?

Quote:
Originally Posted by david s View Post
The required diameter of the chimney depends on the volume of the oven chamber. Your planned height is about normal. Higher gives you some more draw.What kind of oven are you planning to build? Hemisphere, Barrel oval? What internal dimensions?
For a 42" Pompeii you need an8" diam flue pipe.
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Old 02-11-2014, 12:33 PM
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Default Re: Chimney Insulation on WFO?

8" minimum.
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Old 02-11-2014, 10:27 PM
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Default Re: Chimney Insulation on WFO?

I'm unfamiliar with countries that have snow in the winter, so I'm unsure whether what I propose is viable, maybe freezing and thawing is no good for bricks and mortar. However, if you are short of cash, can you find enough secondhand/free bricks to make a brick chimney?

Last edited by wotavidone; 02-11-2014 at 10:30 PM.
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