Chimney Size and Design

[fxpose]

Thanks David, that's exactly what I imagined could happen. I will give it some wiggle room for expansion.

George

[fxpose]

Originally Posted by dmun

Stainless needles are the reinforcement of choice.

I can't seem to find stainless needles locally.....but I have plenty of stainless steel staples for the standard office stapler. Perhaps I can unload a few hundred of those instead.

George

[david s]

That is a really good idea, but you will need around 2% by weight. Thatis a lot of staples. Hope you've got a good office budget.

[canadianmofo]

Hi. New here. Love the site!

I have a design flaw and am trying to resolve a smoke issue (comes out the front).

I have a rectangle burning/cooking surface approx. 100cm x 70cm. The chimney is obviously too small. Any suggestions on chimney size? From what I'm reading, I'm guessing either 6" or 8" would be sufficient. I need to cut my way in to expand the size.

thanks.
- dj

[david s]

DJ,
Post some pics. It might not be just the flue size. Is your door height correct relative to the interioe height? You also need some volume below the flue pipe so the smoke funnels up. Also if your oven is new it will smoke a fair bit because it is still moist and does not fire efficiently. If this is so then maybe you just need to fire it lots and your problem may disappear.
Dave

[BackyardPermaculture]

DJ,
It can also be the wood you are burning. I used some (untreated) softwood offcuts that smoked like crazy, even in a top-down fire. Despite my 6" (6' tall) flue drawing very well, that smoke came pouring out the front. As the oven has dried right up and I'm using decent hardwood and stacking a good top-lit fire, almost no smoke comes out the front.
Cheers,
Mick

[lwood]

MOFO, what is the diameter of your chimney?

[sonomacast]

Originally Posted by brickie in oz

The rule of thumb when building an open fireplace is, flue size should be 10% or more than opening size

I don't understand this, The flu should be 10% or more than what? thanks

[Tscarborough]

10% of the door opening. If your door is 18x18 (324 SqIn), for example, then your flue should be 32.4 SqIn, i.e. 6x6 ID. Fudge on the side of over sized, and realize that that calculation is technically for round flues.

[lcripe]

Originally Posted by Eli Rogosa

Does any have thoughts on placing the chimney on the BACK BOTTOM of the oven?
Wouldn't this vent the cooler air to maintain more heat in the oven??
Eli Rogosa

Yes. Don't!

I think if you check postings here in the forum and do some study you will find that it won't work. Go with the tried and proven.