The input and output data used by external servers for calculation of the duct pressure drop. 
   Namespace:   Autodesk.Revit.DB.Mechanical  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 2015.0.0.0 (2015.0.0.0) 
  Since:  2014 
Syntax
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Remarks
 Profile type, Height, Diameter for round profile or width for other profiles, Length, Density, Viscosity, Roughness and Flow are input field values for the calculation. EquivalentDiameter, HydraulicDiameter, ReynoldsNumber, Velocity, VelocityPressure, Friction, PressureDrop, and Coefficient are output field values for the calculation