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To calculate duct area, multiply the width of the duct by the height of the duct. This gives you the area in inches or centimeters, depending on the unit of measure used for the calculation.
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To calculate the cross sectional area of a rectangular tube, multiply the widths of two adjacent sides of the tube.
Its grams
Area of Duct = (Weidth+Height) X 2 X (Length1+Length2)
Flatten it out then measure it with a ruler! ;)
To calculate the area of an HVAC duct reducer, you measure using a trapezoid area formula, which would be 1/2 times the base plus the top, times the height.
Area = Length * Breadth.
width always comes first
Google: " beam spread rectangular transducer probe"
It is length * width * height.
It is the point where the principal diagonals meet.