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-   -   Angling Chimney Back over Oven (http://www.fornobravo.com/forum/f9/angling-chimney-back-over-oven-6273.html)

domenico 03-10-2009 09:54 AM

Angling Chimney Back over Oven
 
James - Do you have photos of how you built your venting and flue on your oven? I understand that your flue is directly over the outside center of the dome. Im building a 42 Pompeii and Im running the flue above the center of the dome and looking for ideas on how to do this.

Any help I can get is appreciated.

Thanks,

Domenico

james 03-10-2009 12:01 PM

Re: Brick Oven Photos
 
1 Attachment(s)
Hey Domenico,

I just looked back through my photos, and I only have one photo that isn't very helpful. Basically, I used a pair of off-set angles straight from the vent. I measured the length of the diagonal run between the off-sets to get close to center, and then framed the enclosure around the spot where the vertical pipe came up.

Hope that helps. Keep the questions coming.
James

domenico 03-10-2009 01:29 PM

Re: Brick Oven Photos
 
Hi James,

The picture you sent me is extremely helpful. I was thinking of doing the same but wasnt sure how to startnow I know.

Few more questions:
-did you use the 8clay pipe?
-How steep were your angles?
-Did you rest your clay pipe on the dome top or did you have to build a support structure to suspend the weight off the dome?

Youre the Man.

Thank you,

Domenico

james 03-10-2009 01:55 PM

Re: Brick Oven Photos
 
I've done it twice. One with Duravent, where I used two sets (4 total) of 30 angles and one with steel stove pipe wrapped with FB Blanket with one set of 45 angles (I wouldn't recommend the second method and I only did it as a test).

Using lightweight steel pipe means you don't have to worry about holding up the weight and you only have to strap and connect it to the enclosure frame.

James

domenico 03-11-2009 10:23 AM

Re: Brick Oven Photos
 
James,

Okay, Im reworking the venting design and taking your advice.

In the metal vent pipe did you use single wall or the double wall stuff? There is a huge price difference and because I dont have any combustibles in the oven enclosure Im leaning towards the single wall pipe. Do you think this will generate too much heat dispersion inside the enclosure?

I appreciate your feedback and again, thanks for helping me. Im a novice at this so you help is very much appreciated.

Thanks,

Domenico

james 03-11-2009 10:52 AM

Re: Brick Oven Photos
 
We recommend the Duravent double wall system. It is UL approved, it draws really well because it is so well insulated, and the outside stays cool making it easier to install. It has a 2 inch setback from combustibles requirement, which is nice. You can stucco directly on it and the exterior doesn't expand and contract and crack your enclosure. Also, it will last a very, very long time, so you don't have to worry about burning it out and messing up your enclosure. But, it's a little pricey.

If you go single wall, make sure you buy something rated well over 1000F for direct contact with solid fuel flame. B-vent will melt. You can wrap single wall with FB Blanket. Don't get single wall pipe anywhere near a combustible.

Good luck!
James

dmun 03-11-2009 03:31 PM

Re: Angling Chimney Back over Oven
 
Single wall stove pipe is to connect woodstoves with chimneys. It's out in the open and easy to replace when it rots out every few years. If you're walling it in, you want something that will last forever.

kebwi 10-04-2009 06:42 PM

Re: Angling Chimney Back over Oven
 
Reviving a very old thread...

...will terracotta clay flue liners "last forever", to borrow dmun's wording from the previous post? When using terracotta (that's what they're made out of, right?) what sort of dead space should be provided between the flue liner and any surrounding exterior (brick, chickenwire/stucco, etc.).

...on that note...would chickenwire/stucco separated from a clay liner by only a half inch or so (I'm speculating) get too hot for stucco to handle without falling apart?

dmun 10-04-2009 08:13 PM

Re: Angling Chimney Back over Oven
 
Quote:

...will terracotta clay flue liners "last forever",
Well, forever is a long time. That said, the ones in my 1910 house have conspicuously done better than the masonry that encloses them, and they probably are just fired clay, not the refractory material that the modern ones are made from. They are designed to be enclosed in masonry. The air space is a pretty modern refinement: as recently as the middle of the last century they were pretty much just bricked right in. I think the air space allows for differential expansion without cracking.

Just a note: We've had several instances of bare flue tiles cracking in heat, but in most cases the builders have just slathered on some refractory mortar and kept going.


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