Chimney Size
Enter the diameter of your chimney pipe to find out how long it should be.
• A chimney that is too short may produce insufficient draft (drawing of air). A chimney that is too long may cause the air to cool before it exits, reducing effective draft and worse, dripping of exhaust materials onto food!
• Many horizontal smokers have an exhaust between 30-40 inches in length, but there is no hard and fast formula.
• If you are building a horizontal smoker with a vertical cooking cabinet, realize that the cabinet partly acts as an exhaust, thus you may greatly shorten the chimney.
12" chimney may be too short to pull draft.... I'd go with at least 24" length
18.82 FB/CC opening is too small.... Feldon's calculator has a problem.... I would go with 28 sq. in. opening between the FB and CC... also use the same number under the RF plate...