For a boiler combustion air application I have a venturi type of flow measurement device in the ductwork. I want to verify the dp across the device. The ductwork is 18' x 31", the venturi throat is 12 5/8". Can anyone recommend the appropriate formula to calculate dp for air flow at 120 F, 25 in w.c, and 892,000 pph?
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Air flow measurement
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