What Determines the Cross Sectional Flow Area in Air Ducts?

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The cross-sectional flow area of an air duct is calculated by multiplying its width by its height, as demonstrated with the example of a duct measuring 65mm by 150mm, resulting in a flow area of 9750mm². To determine the cross-sectional flow area, only the width and height are necessary; the length of the duct is not required for this calculation. The discussion also seeks clarification on the definition of "cross-sectional flow area," emphasizing its importance in understanding airflow dynamics. Overall, the key focus is on accurately calculating the flow area based on the given dimensions. Understanding these principles is crucial for effective duct design and airflow management.
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I was ask to find the Cross Sectional Flow Area of a air duct given this question : The air duct is a vertically mounted duct of 65mm by 150mm cross-section and approx. 1.2m long.

My working is like this: 65 x 150 = 9750mm2

I just wanted to clarify if my working is right.

Another question i would like to ask, to find Cross Sectional Flow Area, I thought u needed to know the length, width and height? Is it possible to find Cross Sectional Flow Area given just only the length and width?

Hope you guys can help me on it thanks
 
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