Assuming the duct you have in mind is in a 3d shape (length, width, and depth) Your answer will be in a cubic form.
Example: Say it is 2 feet long 1 foot wide and 1 foot tall, the area will be 2 cubic feet.
Measurement of side one * side 2 * side 3 = area.
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Area of round duct is pi times radius squared.
Area = length * width
It is length * width.
The base of a rectangular prism is a rectangle. The area of a rectangle is length times width.
Area of a rectangle is length times width.