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Chimney design question

From the WFO board

Posted by Jason

Here is a link to some pictures I took when I was laying out my bricks to come up with a pleasing design for my oven door and chimney. You will see that there are 3 cornices on the front, and I am thinking of putting the chimney on top of it.

My question is whether the chimney will draw sufficiently. I know that on the CD-ROM, the sides are closed in, where mine are open with the stair-step pattern. Does it need to be closed off for a certain reason, or will my design work as well. Also, is it possible for a chimney opening to be too wide or high, or is too small the only thing to avoid?

Other pertinent info:
Dome height 16.75 in.
Door height 11 in.
Door width 15.75 in.
Flue opening 12x19 in.
Chimney height 24 - 36 in above top level of firebrick in pictures

Also, you will notice the bricks spanning across the door. The next level down will also have brick spanning across (that is where the front angled dome ceiling will meet the door)

Thanks for any help,

by Rado Hand on Google+

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