Share Email Facebook Twitter LinkedIn MEPSection.Friction Property The friction of the section. Namespace: Autodesk.Revit.DB.MechanicalAssembly: RevitAPI (in RevitAPI.dll) Version: 26.2.0.0 (26.2.0.0) Syntax C# public double Friction { get; }Property ValueDouble Remarks In one section, all section members have same friction. Default unit is Feet of Water (60 °F) per 100 feet. For Duct, unit type is UT_HVAC_Friction. For Pipe, unit type is UT_Piping_Friction See AlsoReferenceMEPSection ClassAutodesk.Revit.DB.Mechanical Namespace