280 inches squared.
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What is the minimum cross sectional area of the flue for a 14 ft tall fireplace with an opening 20 in x 24 in?
The area of a parallelogram with a base of 20 inches and a height of 8.5 inches is 170 square inches.
Taking the four sides as each having 6 inch length, and the sum of the widths and heights of the sides being 14 inches, the area of the sides is 84 square inches (6 x 14), and the area of the ends is 24 square inches (2 x 3 x 4), for a total surface area of 108 square inches.
Its height is: (144*2)/20 = 14.4 inches
5 x 4 inches = 20 inches squared.