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Old December 24th, 2011, 02:17 AM
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Default Stack Opening Size

What size opening under the stack?
I am building a new arch out of masonry, the floor will be slanted similar to the factory arches. I will be using 8" pipe for the chimney. How can I determine the correct area under the stack for a good draw. I know there is a formula for this, just can't find it.

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Ric Oestreich
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Old December 24th, 2011, 11:18 AM
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A few thing to consider. If your rig is 24" wide you want to have the Transition from 24" down to 8 to be gradual. ". You want that transition to be AFTER the end of the pans. Are you going out the back of the arch or out the top? If you look at pictures of arches with the flue stack in place you will see the transition base stack.
Back pressure is important to consider when building the flue stack. You want the HOT flue gases to stick around and do their job before exiting the arch. You can install a Dampener in the pipe section to regulate back pressure. If you haven't started the base of the arch I would consider a 4-6" pipe coming into the combustion chamber for a blower. Even if you don't want to do the blower consider the pipe with a plug in it.
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Old December 24th, 2011, 03:31 PM
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Default Stack Opening

Ok, I will use a 6" diam. that I'm going to exit out the back of the evaporator. My Pan will be a 24' x 48" so I guess the slope in the base will have to be 6" min. at the chimney opening. I could go out the top as well which I would be able to reduce the 6" down to about 3". I have seen a formula for this, which gives the size needed in height at the end of the tapered floor in the arch. Hope you understand what I mean, I really don't know how to explain it.
Thanks for responding & taking time out to help a rookie.

Ric.
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Old December 24th, 2011, 04:00 PM
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Wait slow down how did we go from to 8" to 6" to 3" why do you want to restrict that down so much. You are thinking like your making a BBQ grill and your not your making a blast furnace.
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Old December 24th, 2011, 08:49 PM
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Default Fire box floor slant

It's obvious I'm not explaining this correctly. The info. I am looking for is: You have the fire box at one end, from there the floor slants upward in the arch to the chimney end. My question is how much space should I have under the pan at the chimney end of the slanted portion. The 3" measurement was a guess for the space under the pan at the chimney end from the fire brick to the bottom of the pan. I can run the chimney straight up out of the box such as manufactured ones. Or I can run it out the back. I just thought maybe an 8" chimney pipe may be too large, 6" may be better.

Thanks so much for your time.
Ric.
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Old December 24th, 2011, 09:49 PM
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OK what do you have for a pan? Flat, drop or a raised flue. if its drop or raised leave about 1" under the flues. You want to force the flames/heat up through the flues. It was the use of the word Diameter that threw me off.
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Old December 25th, 2011, 04:00 AM
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Default Space under pan

It will be a flat bottom from Jim Shumacher.
Thanks again!
Ric,
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Last edited by 1badsapper; December 25th, 2011 at 11:55 AM.
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Old December 25th, 2011, 02:40 PM
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Default Space under pan formula

How to determine the space under your pan at the stack end, from the brick.

It's the area of your stack: A=3.14 x r x r.

r is the radius of your stack. So a 6-inch stack has a surface area/opening of 3.14 x 3 x 3 = 28.26 sq. in. An 8-inch stack is 3.14 x 4 x 4 = 50.24 sq. in.

The cross section of the space under your pans is rectangular, so its area is just l x w. Since the width is fixed, the length or height of your space can be found by dividing your stack surface area by the width of the inside of your arch.

So if the width of the inside of your arch (brick to brick) is 20 inches and you have an 8-inch stack, just divide 50.24 sq. in. by 20 in. to get 2.5 inches for the height of your space under your pans.
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http://shorthairsshorttales.blogspot.com/
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Old January 24th, 2012, 09:47 PM
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Would the clearance under a 5.5" drop flue pan be less than for a flat pan ?
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