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# RF calculator?

but have yet to receive an answer so perhaps this may help....
"Volume in cubic inches x .001...volume of what, the CC or the FB?

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Edit: 2-16-2014 ; You will need a hand held calculator, smart telephone, or your computer.... calculator, to use this tutorial.. It does not crunch numbers for you.....

Calculations for a standard design, reverse flow smoker..

Gallons X 231 = volume in cubic inches.... Sometimes the tag, in gallons, reflects a 20% air space for expansion....

Volume of the Cook Chamber.... Use the Inside Diameter of the tank...

Diameter X Diameter X 0.7854 X Length = Volume in cubic inches

Volume in cubic inches X 0.004 = FB/CC opening in square inches

Volume in cubic inches X 0.004 = Area under the RF plate in square inches

Volume in cubic inches X 0.004 = Area required at the end of the RF plate in square inches

Volume in cubic inches X 0.33 = minimum volume of the Fire Box

The above areas are necessary for great air/heat/smoke flow.... using less may cause an overheated FB.... Narrow / Long CC may require an increase in those numbers due to increased surface area friction to volume... Wide/Fat Short CC may use smaller numbers due to reduced surface area friction to volume...

Volume in cubic inches X 0.001 = FB air inlets in square inches...

Recommended upper and lower air inlets... Upper air inlet directly across from the FB/CC opening to facilitate moving heat from the FB to the CC, and insuring good air flow through the CC.. The lower air inlet should be situated at or below the fuel grate.... The two air inlets can share the designated square inches of opening....

If you do not feel like crunching numbers, and have a computer with Excel...

https://www.dropbox.com/s/87nq0wly939xtnp/Dave%20Omak%20Smoker%20Calculator.xls?dl=0

And my question still hasn't been answered...
"Volume in cubic inches X 0.001 = FB air inlets in square inches.."

Volume of WHAT in cubic inches....the firebox or the cook chamber?
I assume the cc...but want to make sure. .
Quote:
Originally Posted by martyinco

If you do not feel like crunching numbers, and have a computer with Excel...

https://www.dropbox.com/s/87nq0wly939xtnp/Dave%20Omak%20Smoker%20Calculator.xls?dl=0
Don't have Excel...isn't there a "free" version of some sort...perhaps in the "free" version of MS Office?

Calculations for a standard design, reverse flow smoker..

Volume of the Cook Chamber.... Use the Inside Diameter of the tank... All smoker calculations are based on the volume of the Cook Chamber....

Diameter X Diameter X 0.7854 X Length = Volume in cubic inches / 231 = Volume in gallons

Volume in cubic inches X 0.004 = FB/CC opening in square inches

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