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

MikeFromTexas

Newbie
4
4
Joined Jan 11, 2020
Finished my reverse flow build about 1 month ago. Not wanting to reveal my nerdy innards by performing a flow analysis through engineering software, I decided to follow the recommendations in this thread/tutorial. All I can say is that my pit is a great flowin machine. Great temperature control, temperature distribution and doesn’t seem to use that much fuel (about 12” log per hour).

specs:
45” cookin chamber
18” OD x 1/4 wall.

i’ll say this though, I spent a lot more money than I thought I would. Kinda like when I build ARs..
 

daveomak

SMF Hall of Fame Pitmaster
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Joined Nov 12, 2010
Mike From Texas, thanks for the revue of our tutorial... Most folks have found the same...
 

Trus

Newbie
18
2
Joined Feb 11, 2020
Hello Im new to the site and getting ready to build my first smoker. Been smoking on a few types of smokers at academy and such. Anyways, I am looking to build a squared CC Reverse Flow. I started to calculate the dimensions as stated in the thread but im not sure if im doing it correctly. Here is what i have. Please correct me if im wrong.

Cooking Chamber: H= 36" (3ft) W=42" (3.5ft) L=30" (2.5ft)
Ive looked up the conversion for a square box to gallons and this what I have.
cu ft = (3ft) (3.5ft) (2.5ft) = 26.25cu ft
gal = cu ft * 7.48 = 26.25cu ft * 7.48 = 196.35 gal

Volume in cu in = Gallons * 231 = 196.35gal * 231 = 45,3656.9 cu in

Volume of CC (Used Inner Diameter)
H=35 1/2" (2.95833ft) W= 41 1/2" (3.45833ft) L= 29 1/2" (2.45833ft)
Volume of CC in cu in = (35.5)(41.5)(29.5)(0.7854) = 34134.2 cu in
FB/CC Opening in sq in = Volume in cu in * 0.004 = 34134.2 cu in * .004 = 136.537sq in
Area under RF Plate sq in = 136.537 sq in
Area required at the end of the RF Plate = 136.537 sq in
FB Volume Minimum = Volume in cu in * 0.33 = 34134.2 cu in *0.33 = 11264.3 cu in
FB Air Inlet = Volume in cu in * 0.001 = 34134.2 * 0.001 = 34.1342 sq in
Exhaust Stack Volume (ESV) = 34134.2 * 0.022 = 750.952cu in
Stack Length = ESV / 0.7854 (Stack Diameter)(Stack Diameter)
Stack Length = 750.952cu in / 0.7854(6)(6) = 26.5594

Okay im done, Im not sure if the calculations are correct please help me out. THank you
 

daveomak

SMF Hall of Fame Pitmaster
OTBS Member
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Joined Nov 12, 2010
Refigure the numbers using length of the cylinder, diameter of the cylinder... That's all you need...

Height, width, length are confusing and there are only 2 dimensions to a tank...
 

Trus

Newbie
18
2
Joined Feb 11, 2020
Refigure the numbers using length of the cylinder, diameter of the cylinder... That's all you need...

Height, width, length are confusing and there are only 2 dimensions to a tank...
Thanks for the reply,, if the depth of the cc is 30 in, would that be my diameter?
 

daveomak

SMF Hall of Fame Pitmaster
OTBS Member
SMF Premier Member
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Joined Nov 12, 2010
Look up diameter, length etc...
 

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