Not a reverse flow

[jstone1982]

im trying to build a smoker from and old propane tank trying to determine the size of the box (square) based on the size of the tank which id a 100 gallon tank 5ft long *5ft around

 

[Blarson6]

jstone,
I'm a new member here as well but found this bbq calculator, hope this helps.

Feldon's BBQ Pit Builder Calculator

 

[daveomak]

A better calculator.....

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