.ClaRa.SubSystems.Furnace.HopperSlice_L4_AdditionalAir.PressureLoss_FTW .ClaRa.SubSystems.Furnace.HopperSlice_L4_AdditionalAir.PressureLoss_FTWmodel PressureLoss_FTW = ClaRa.Basics.ControlVolumes.Fundamentals.PressureLoss.Generic_PL.LinearPressureLoss_L4;