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Hydraulic diameter with a centrifugal fan

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MechEng92

MechEng92

Mechanical
Joined
May 12, 2015
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61
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GB
I've been using an equation given by a fan supplier to calculate the correction factor based on the hydraulic diameter of the "box" around the fan. Does anyone know if this is effected if the box walls are perforated? Is there another equation to use?
 
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