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Having a bit of a pickle on firebox to chamber opening.

LongSmoke1032

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Joined Mar 22, 2020
I’m building my own smoker opted to build a regular offset as I’m somewhat of a newbie here. I have all my dimensions, how my set up is going to be everything but I’m having a bit off issues with the firebox to chamber opening. I seen a whole lot of threads, measure from the charcoal grate to top of fire box, keep intake vents at grate level, stack should be 30 + inches and so on but this opening has me stumped and math isn’t my best subject. My build includes using my chamber as a grill as well with slide out grates, slide out lump grate and ash tray. I’m using 1/4 inch carbon steel cylinder pipe and 1/4 inch steel plate for the firebox, any help and suggestions would be greatly appreciated. My build dimensions are as follows...

Chamber
24” x 48 Cylinder w/ 1/4 walk thickness.
I used the 23.5” diameter for the calculation.

Firebox
15” H x 22.5” W x 21.5” L these are measurements from the lump grate to top of fire box the actual dimensions are 21” H x 22.5” W x 21.5” L these are all inner dimensions. will as well have slide out lump grate and as tray.

Firebox to Chamber Opening
11.88” recommended half moon diameter with 55.47” square inch I’m stumped on this one here so please feel free to give your suggestions and help.

Smoke Stack
5”calculator is giving s size of 17.71 inches tall but some threads say it should be 30 + inches tall, suggestions and help here would greatly be appreciated.

Intake Inlets
4” calculator says I need 1.67 so I’m putting in 2 of them. Help and suggestions would help here as well, do the intakes need to be a solid opening with the adjust or the circular adjustable type?

Any and all help and suggestions would greatly be appreciated, this forum is great has a whole mess of information, thank you fellow meatheads.
 

daveomak

SMF Hall of Fame Pitmaster
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Joined Nov 12, 2010
You should not use Feldon's....
Use our tutorial to build your smoker.... You will be glad you did...
FB /CC opening should be about 87 sq. in.

 

LongSmoke1032

Newbie
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Joined Mar 22, 2020
You should not use Feldon's....
Use our tutorial to build your smoker.... You will be glad you did...
FB /CC opening should be about 87 sq. in.

Thank you I appreciate the help, so Feldons calculator isn’t at all worth using?
 

daveomak

SMF Hall of Fame Pitmaster
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Joined Nov 12, 2010
Feldon's is a great work put together by many dedicated folks...
I used it for the base of the work done here by our members...
We just tweaked it a bit and improved it a bit....
 

LongSmoke1032

Newbie
5
0
Joined Mar 22, 2020
Feldon's is a great work put together by many dedicated folks...
I used it for the base of the work done here by our members...
We just tweaked it a bit and improved it a bit....
Thank you appreciate the information I’m not too far from putting everything together and definitely stumped on this firebox to cooking chamber opening. First build so going offset, again I appreciate the help.
 

shaydu

Newbie
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Joined May 15, 2020
Dave i searched the files and the thread you posted for the "plug an play caluclator" since the feldon calculator was not recommended. can you direct me to a more precise location to it in the thread please?
 

daveomak

SMF Hall of Fame Pitmaster
OTBS Member
SMF Premier Member
26,540
3,944
Joined Nov 12, 2010

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