What instrument measures wind speed and air flow in ducts?

What instrument measures wind speed and air flow in ducts?

• A. Vane Anemometer
• B. Barometer
• C. Thermometer
• D. Hygrometer

Answer: (A)

Measuring how fast air moves through a duct requires detecting air velocity. A vane anemometer uses a small vane or propeller that spins as air flows past it, and the rotation rate converts directly into air velocity. In duct work, this velocity can be used with the duct’s cross-sectional area to estimate the airflow (CFM), making it the practical instrument for wind speed and flow in vents. The other tools measure different properties: a barometer gauges atmospheric pressure, a thermometer measures temperature, and a hygrometer measures humidity. None of those directly assesses how quickly air is moving in a duct.

Measuring how fast air moves through a duct requires detecting air velocity. A vane anemometer uses a small vane or propeller that spins as air flows past it, and the rotation rate converts directly into air velocity. In duct work, this velocity can be used with the duct’s cross-sectional area to estimate the airflow (CFM), making it the practical instrument for wind speed and flow in vents. The other tools measure different properties: a barometer gauges atmospheric pressure, a thermometer measures temperature, and a hygrometer measures humidity. None of those directly assesses how quickly air is moving in a duct.