Duct diameter should be 4" or more. Take readings in a smooth and straight section of the duct. The section should be 1.5 duct diameters upstream and 8.5 duct diameters downstream of any disturbances. Use a flow straightener upstream of the Pitot tube if possible. Pitot tube has a flow coefficient, or correction factor, of K is equal to 0.84. Probe is rated to 1500 degree F (815 degree C). If you use any of FlowKinetics instruments the velocity is automatically calculated. As an approximation within 5 percent mean velocity in the duct corresponds to 90 percent of the velocity measured at the center of duct.
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