NV C-21C Sheet Metal Practice Questions - Nevada C-21C Sheet Metal Contractor Examination Exam

What is the relationship used to size HVAC duct airflow from a known cross-section and velocity?

CFM equals static pressure times duct gauge CFM equals duct perimeter times velocity CFM equals cross-sectional area in square feet times velocity in feet per minute CFM equals duct length times aspect ratio

Correct Answer:

CFM equals cross-sectional area in square feet times velocity in feet per minute

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