Chimney Primer Design Styles, Chimneys and Finish Discuss Chimney Primer in the Pizza Oven Design and Installation forums; I tried to attach pictures of both ovens, it didn't work for whatever reason. My pompeii oven has no chimney. ...

[anduzy]

I tried to attach pictures of both ovens, it didn't work for whatever reason. My pompeii oven has no chimney. It's outside so no chimney required to draw away gasses. The floor ht. is 48" so I don't bend over the opening. Any air leaving the oven is very hot and ascends immediately. I've never had sparks escape. It is easier to light, I don't have to build the fire as far forward. I'm closer to the pizzas so they're easier to handle. The Premio 120 is built onto a wooden wagon for use at renaissance fairs. This oven has the arch & chimney. I'm going to have to re-build my tool handles from 5' to 6 1/2' in order to avoid roasting my left hand. Don't get me wrong, I love my Premio. I just want to be closer to the action & on a wood wagon, I could REALLY do without the extra weight.

[MK1]

This may not pertain but i do have some experience with aerodynamics and flow. Square straightens removes turbulence and improves flow rate

[blacknoir]

Holy Cow that DuraVent is expensive isn't it.. especially if you need 4+ feet of it to go through a pergola which I also have to do. 2 more questions. First, did you guys go with 6" or 8" pipe? Second, any reason not to do a clay liner, if it's cheaper, for the first few feet and then switch to DuraVent?

[dmun]

There's no reason not to build the entire chimney in the traditional manner, with the flue tile interior, a masonry exterior, and a chimney cap to keep them aligned. I see no reason to mix the two styles. The stainless flue systems are for people with more money that time, not that there's anything wrong with that.

An eight inch square flue tile is big enough for any domestic oven.

[blacknoir]

Any idea if they make a tile spark arrestor cap? I really like those clay caps but I should probably get a cap with a spark arrestor to be safe. My WFO will be right next to a large wooden deck and the chimney will run either through a pergola or be right next to it.

[dmun]

Absolutely, they're right on the shelf at home depot. They clamp to the corners of the flue tile. Look around your neighborhood, you'll see half a dozen on peoples chimneys (the keep birds and squirrels out)

That said, I have yet to put one on mine. I should: some soot washes down in rain and makes my landing unsightly.

[blacknoir]

Heh, I'm in a suburb of MN and it's all metal pipes and caps around here. Some of the local farms might be a different story. I'll have to look closer at my box store for clay parts, figured I'd have to go to a special store for those.

[dmun]

I'll have to look closer at my box store for clay parts

No, you'll need to go to a brickyard for the flue tiles, but they sell the caps at home depot. they are more of a mass market item because the old ones rust out.

[Harvybing]

What about an indoor fireplace with openings on all 4 sides. I've seen some but don't undertand how they insure that they draw correctly. Anyone have any experience on these?

[Lars]

I am still wondering about the arch/support flue weight issues.

I had an issue with my front arch ( which will support half the weight of my flue -- a 2' section 8.5x13" ) but I am buttressing it with bricks on either side!

I think I am going to just try a mortar/firebrick transisition ( I am pretty sure smoke will not be so laminar it will need a smooth smooth surface) and, though rounded edges would certainly help ( in theory) I am betting that the smokes gonna go up at the first opportunity ( my flue) any way it can.

L.