Solution: To cool a given room it is necessary to supply 5 ft^3/s of atmospheric pressure, 60 degrees F air through an 8 in-diameter duct. Approximately how long is the entrance length in this duct?

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To cool a given room it is necessary to supply 5 ft^3/s of atmospheric pressure, 60 degrees F air through an 8 in-diameter duct. Approximately how long is the entrance length in this duct?