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Three Phase. Horsepower = 1.73 x Amps x Volts x Motor Efficiency x Power Factor (Actual) (Brake) 746 Single Phase ... Calculation of Velocity and Volumes 1. A single duct/ single zone A/C roof top unit is supplying air to the conditioned space by way of a 24” by 12” supply duct. Calculate the air velocity as well as the volume (CFM). ................
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