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firebox size

 
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dmike25
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Joined: 27 Dec 2009
Posts: 666
Location: Colorado Springs (sometimes)

PostPosted: Sun Jan 11 15 12:11 pm    Post subject: firebox size Reply with quote

I'm building an offset with tuning plates, my first build.
24"d x 44" long. 1/4" wall pipe, 3/8" plate ends. 4" X 36" chimney already on.
It will have a square firebox, with the door on the end, and the intake in the door. If I make the box a 20" cube, it will be 20% oversize according to Feldon's calculator, which I think would be okay. I don't know why, but I keep thinking that I should make the firebox longer, 20" X 20" X 22". According to the calculator this would be about 33% more than needed. Is 33% too much oversize?
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k.a.m.
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Joined: 12 Dec 2007
Posts: 26016
Location: Southeast Texas.

PostPosted: Sun Jan 11 15 9:15 pm    Post subject: Reply with quote

The firebox will work at 20" Sq.
It will also work at 20" x 20" x 22".
The difference in one or the other is which ever one you choose you will not know how the other would have worked with the cooker, you will learn how to operate the cooker with the chosen dimensions. Wink
Go with your gut feeling on this, you evidently have some reasons besides being too small for the chamber. To satisfy these reasons and sleep at night build it slightly bigger.
I hope this helps. Very Happy
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dmike25
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Joined: 27 Dec 2009
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Location: Colorado Springs (sometimes)

PostPosted: Tue Jan 13 15 10:29 am    Post subject: Reply with quote

k.a.m. wrote:
you will learn how to operate the cooker with the chosen dimensions.


Well there I go again, missing the obvious answer to my own question Confused I'll make it 22" long, and I'll adjust the intake openings accordingly. I'm thinking 30 square inches of intake will work.
I've been watching Troy's X-4 build, and I really like the looks of the charcoal grate he built, which was mayhaps your design Question If I do build one like it, I'll probably have to build the framework with angle iron, the only tube steel I have on hand is round Wink Laughing
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