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A Pitot tube is a pressure measurement instrument used to measure fluid, flow velocity,The basic Pitot tube simply consists of a tube pointing directly into the fluid flow. As this tube contains air, a pressure can be measured as the moving air is brought to rest. This pressure is the stagnation pressure of the air, also known as the total pressure, or sometimes (particularly in aviation circles) the pitot pressure.

the most practical instrument to use is the Pitot tube. The Pitot tube can be inserted through a small hole in the duct with the Pitot connected to a U-tube water gauge or some other differential pressure gauge for determining the velocity inside the duct.

The quantity of air flowing through the duct each minute can then be estimated from:

Volume Flow Rate (cubic feet per minute) = Duct Area (square feet) × Velocity (feet per minute) Velocity is typically measured in feet per minute in such applications.