Throat opening and chimney opening

[BeppeSamm]

Hi, I'm from Malta and am designing an offset smoker (NOT reverse flow) and have most of the dimensions finalised other than the (i) opening from the cook chamber to the firebox, and (ii) opening from the cook chamber to the collector / smoke stack.

I plan on building an 120 gallon tank style smoker with the following dimensions:

Cook chamber: 71 inches length, 22.25 inches diameter
Firebox (semi-insulated at the bottom): 29.75 inches length, 22.75 inches height and 20.25 inches width
Smock stack (excluding collector): 50 inches height and 6.75 inches diameter
Collector: 11 inches length, 6.75 inches height.

I planned on placing the firebox slightly below grate level with the collector being at grate level. I'm attaching a photo of what I want to achieve.

Can someone please help regarding: (i) dimensions and placing of the opening from cook chamber to the firebox, and (ii) dimensions and placing of the opening from the cook chamber to the collector / smoke stack?

 

[JLeonard]

daveomak is the answer man on this. Hopefully he'll chime in and help ya out.

Jim

 

[daveomak]

The calculations are the same for a reverse flow..
They will make you a great smoker...

Standard Reverse Flow Smoker Calculator... by DaveOmak and others... Ready to use.. rev5.. 6/19/15.

Here's to "Alien BBQ" and the folks that first put the calculator together and "1728 Software Systems" for this great "Circle Calculator" and all the folks at "SmokingMeatForums", with a special shout out to Ribwizzard, that contributed their ideas and feedback while this thing was coming...

www.smokingmeatforums.com

 

[BeppeSamm]

The calculations are the same for a reverse flow..
They will make you a great smoker...

Standard Reverse Flow Smoker Calculator... by DaveOmak and others... Ready to use.. rev5.. 6/19/15.

Here's to "Alien BBQ" and the folks that first put the calculator together and "1728 Software Systems" for this great "Circle Calculator" and all the folks at "SmokingMeatForums", with a special shout out to Ribwizzard, that contributed their ideas and feedback while this thing was coming...

www.smokingmeatforums.com

Thanks daveomak - just to confirm that the calculator you provided in the above link also applies to a standard offset smoker and not only to a reverse flow offset smoker?

 

[SmokinEdge]

Thanks daveomak - just to confirm that the calculator you provided in the above link also applies to a standard offset smoker and not only to a reverse flow offset smoker?

Not speaking for Dave but, they are the same.

 

[BeppeSamm]

Not speaking for Dave but, they are the same.

Great thanks!

 

[BeppeSamm]

I have another question: my grease drain is on the left hand side of the smoker. Does it make sense to produce the legs of the left hand side of the smoker slightly smaller when compared to the legs on the right hand side of the smoker (e.g. 24 3/4 inches left vs. 25 inches right) in order for the grease to move towards the grease drain? If so, is 1/4 inch too much / too little? Should the gap be larger / smaller?

Or would the above increase the chances of having a grease fire, in which case it is better to leave both sides equal and the cook chamber flat?