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120 Gallon smoker build

justintr34

Newbie
2
3
Joined Feb 24, 2020
Hey everyone,

Long time lurker first time poster. I made a fire box in high school while in welding school and never put it on a chamber. I now have a 120 gal propane tank that I have cut open and started to prepare. My question is whether or not I should build a new firebox or not. The firebox I already have built is 16.5" wide by 16.5 tall" and 20" long, which gives me 5,989 cubic inches. According to the calculations it says I need 9,240. I have never smoked meat before and have very little knowledge on the topic so im not sure how big of a deal it will be.
 

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JC in GB

Master of the Pit
SMF Premier Member
1,629
903
Joined Sep 28, 2018
There are threads on this forum that will give you the proper calculations for making your pit.

Are you making a conventional or reverse flow unit? If your unit doesn't have the right air flow, you will have no end of problems.

It is well worth it to get everything measured and calculated first.

Happy smoking..... :emoji_cat:

JC :emoji_cat:
 

smokin peachey

Master of the Pit
OTBS Member
★ Lifetime Premier ★
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1,698
Joined Aug 1, 2016
If you want to use the 120 gallon tank you might wanna build a new bigger firebox. You also could use the fire box you have and cut the tank down some.
Are you using Feltons calculator?
 

justintr34

Newbie
2
3
Joined Feb 24, 2020
Yeah I am using the calculator. That’s where I got my numbers from. I just didn’t wanna have to spend money on more steel plate if I didn’t need to.
 

JC in GB

Master of the Pit
SMF Premier Member
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903
Joined Sep 28, 2018
Yeah I am using the calculator. That’s where I got my numbers from. I just didn’t wanna have to spend money on more steel plate if I didn’t need to.
It will be money well spent to get the proper fire box. Looking forward to seeing pics of your build.

JC :emoji_cat:
 

kmmamm

Smoke Blower
134
43
Joined Apr 30, 2016
Alternatively, you could simply cut the 120gal tank down sizing it to the firebox. Would be a whole lot faster and cheaper than building a new firebox. Use it to learn, if at some point you find the downsized smoker isn’t big enough, you can always start a larger build from scratch.
 

dacolson

Newbie
22
29
Joined Mar 20, 2020
Hate to see you cut down that 120 gal tank. What are the dims? 24" x 67"? That's a great size IMO. Look around for cutoffs or random steel on Craigslist of Facebook Marketplace. You'll be surprised how much you can find for cheap. Hang on to the firebox for another project. Like a vertical smoker!
 

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