Units: f and K are unit-less. D and Leq have the same units. For
instance: If D is in meters, then Leq is in meters. If D is in inches, then Leq
is in inches. If D is in ft, then Leq is in ft.
Equivalent length equation: Leq = K D / f
If rectangular duct, compute D from: D = 4 A / P
where A=Area of duct and P=Perimeter of duct. Equations from references listed at Discussion
and References for Closed Conduit Flow.
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