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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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7y ago
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Q: How do you find area of rectangular duct?
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