I am in the process of building a cold smoker.. I am using the basic charcoal grill (about a $20 grill.. I want to add A firebox off to the side.. But I'm having trouble getting the size of my firebox.. My smoke box dimensions are 20W/20L/14H.. When I put that in the calculator I come up with an 1866 cubic inch fire box.. Can someone give me the dimensions in inches of my side, top, and back of my fire box
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