What are the two ranges of FPMs that airflow monitors?

• A. 0-1000 and 0-5000 FPM
• B. 0-1000 FPM
• C. 0-5000 FPM
• D. 5% accuracy

Answer: (A)

Airflow monitors measure air velocity in feet per minute, and many models offer two selectable ranges to handle both low and high flow conditions. The lower range up to 1000 FPM gives better resolution when air is moving slowly, which is common in cleanrooms, instrument rooms, or near gentle vents. The higher range up to 5000 FPM keeps readings accurate when air is moving much faster, such as in larger ducts or around powerful fans, preventing the display from saturating and preserving the ability to track changes. Using both ranges ensures the instrument stays useful across the full spectrum of expected conditions. The other options either describe only a single range or provide an accuracy percentage, which isn’t a velocity range.