My 3-Legged Dome

[Neil2]

Re: My 3-Legged Dome

Here is what I used for my inner mold (available cheap $5-$6 and in many sizes from any heating supply place):

[fxpose]

Re: My 3-Legged Dome

Neil, I looked for that exact vent but couldn't find it anywhere. If it was available to me I certainly would have gone that route instead of casting one from scratch.
Where did you get yours?

George

Edit: I found the website where they have these vents in various sizes. I searched for floorboxes. My search a few weeks ago led me nowhere as I had no idea what they were called. Yes, I could have used one of these instead.

[Neil2]

Re: My 3-Legged Dome

They are used in heating ,ventilation and air conditioning ducts. Look up HVAC on your local business directories.

[fxpose]

My vent is cast

I just removed the forms off the vent. This sucker is hefty.

George

[fxpose]

Re: My 3-Legged Dome

Mounted the vent.

As you can see in one of the photos I placed a piece of left over 3" ceramic board and some temporary bricks on the top of the dome to see if they'll work as support for the chimney pipe. The pipe and the support will all be buried in vermicrete.
The chimney will exit straight out middle of the dome.

George

[fxpose]

First fire and smoke test

I burnt a Dominos pizza box this evening to check for smoke, running a temporary 48" stove pipe. The vent drew well with this small fire. But of course, I have no idea yet how well it will vent with a roaring fire.

George

[Dino_Pizza]

Re: My 3-Legged Dome

Burn the Dominos box! Yah .

George, you make casting a vent look easy. It really doesn't seem that much harder than cutting lots of brick or clay pipe or even fitting metal pipe. It's a good option that can solve lots of problems. Glad you did it.
-Dino

[leckig]

Re: My 3-Legged Dome

This thread is very interesting to follow. So much creative thinking. Thanks George and congratulations!

[fxpose]

Re: My 3-Legged Dome

Thank you Dino and leckig.

The clay sculpting and ceramics classes I took in community college many many years ago certainly helped make casting the vent an easy task.

The round front profile and the very shallow entry of the oven have been slowing me down at this stage. Also, I will be making some changes to the outer entry as I feel it is a bit too splayed/flared out. I intend to bring them in a bit, but not affect the inner opening.

George

[turkey]

Re: My 3-Legged Dome

looking very nice, thoes casts look as good if not better to the commercial ones

when you say the chimney will come right out the middle do you mean like here

MHA News - 2006 Meeting - Backyard Oven with Peter Moore

where the vent at the front then runs back over the top with a central chimney stack?

[fxpose]

Re: My 3-Legged Dome

Thanks turkey. Yes, the oven will have a central stack, the only difference being mine will be routed to the middle with a steep stove pipe before elbowing out the top.

George

[Neil2]

Re: My 3-Legged Dome

"mine will be routed to the middle with a steep stove pipe before elbowing out the top."

Curious as to why you are doing it that way.

Aesthetics ?

To get the stack back out of the way ?

[fxpose]

Re: My 3-Legged Dome

"mine will be routed to the middle with a steep stove pipe before elbowing out the top."

Curious as to why you are doing it that way.

Aesthetics ?

To get the stack back out of the way ?

The main reason for locating the stack a bit further back is to "hide" it from view from the street and the front of the house. As you enter the driveway most of the oven is tucked away in the nook except for the front of the oven which is visible. I did not want a tall smoke stack to become an eyesore as you entered into the driveway. The only part of the chimney you will see will be a short section at the very top and the cap.
A more ideal solution is to locate the stack way back in the corner of the nook, at the rear of the oven, but I did not like some of the drawings I did on that design.

George

[fxpose]

Re: My 3-Legged Dome

I did not get much work done this week as I'm waiting for the rest of my chimney components to arrive. I should get them today.

Yesterday I narrowed the outer entry width by 3" and did a little cosmetic touch up surrounding the entry.

George

[fxpose]

Re: My 3-Legged Dome

I did not want to waste any so I used up all of 50ft of 24" wide x 1" thick blanket....that's 100 sq/ft. I piled the remainder on top as you can see. The side walls have 3" of blanket and I think the top has about 6" worth.

George

Edit: BTW, the outside facing brick surfaces will be stuccoed as well. That's why I made them flush with the base.