MEPSection Flow Property |  
 The flow of the section. 
 Namespace: Autodesk.Revit.DB.Mechanical
Assembly: RevitAPI (in RevitAPI.dll) Version: 25.0.0.0 (25.0.0.0)
 In one section, all section members have same flow. Default unit is Cubic feet per second. For Duct, unit type is UT_HVAC_Airflow. For Pipe, unit type is UT_Piping_Flow