Which unit is used to express airflow volume in HVAC ductwork?

Which unit is used to express airflow volume

Multiple choice — select the best answer

APounds per square inch (PSI)
BFeet per minute (FPM)
CCubic feet per minute (CFM)
DInches of water column (in. w.c.)

✓ Correct answer: C. Cubic feet per minute (CFM) Airflow volume is measured in cubic feet per minute (CFM). FPM measures velocity, and in. w.c. measures static pressure — both related but distinct from volume.

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Topic: Airflow & Ductwork

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Which unit is used to express airflow volume in HVAC ductwork?

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