313D Residential Air Conditioning Systems Mechanic

In rectangular duct design, what does the term 'aspect ratio' describe?

The ratio of the duct's total length to its total CFM. The ratio of static pressure to velocity pressure. The ratio of the duct's longer side to its shorter side. The ratio of supply airflow to return airflow.

Correct Answer:

The ratio of the duct's longer side to its shorter side.

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