Pitot Traverse Airflow (Velocity Pressure to CFM)
Field airflow from a Pitot traverse: V = 4005 x sqrt(VP_avg) for standard air, then CFM = V x duct area. 0.15 in wc in a 24x12 duct -> 1551 fpm, 2.0 ft^2, 3102 CFM; a lighter 0.05 in wc reads 896 fpm (the square-root relation). A field measurement, not a substitute for a calibrated flow station.
Formula and source
V = 4005 sqrt(VP_avg); A = (w x h)/144; CFM = V x A.
The Pitot-traverse airflow measurement (velocity-pressure to velocity, standard air) from ASHRAE Fundamentals / AABC-NEBB field practice, by name.
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