diff --git a/doc/testFile/HVACSystemWorkflow.gh b/doc/testFile/HVACSystemWorkflow.gh
index 383f6fed..8a6d35a3 100644
Binary files a/doc/testFile/HVACSystemWorkflow.gh and b/doc/testFile/HVACSystemWorkflow.gh differ
diff --git a/src/Ironbug.Grasshopper/Component/Ironbug/Ironbug_AirLoopHVAC.cs b/src/Ironbug.Grasshopper/Component/Ironbug/Ironbug_AirLoopHVAC.cs
index 2f57ac56..a02a2249 100644
--- a/src/Ironbug.Grasshopper/Component/Ironbug/Ironbug_AirLoopHVAC.cs
+++ b/src/Ironbug.Grasshopper/Component/Ironbug/Ironbug_AirLoopHVAC.cs
@@ -48,7 +48,7 @@ protected override void SolveInstance(IGH_DataAccess DA)
             var supplyPathCount = this.Params.Input[0].VolatileData.PathCount;
             var demandPathCount = this.Params.Input[1].VolatileData.PathCount;
             var dualLoopObjs = supplyComs.Where(_ => _ is HVAC.IIB_DualLoopObj);
-            if (supplyPathCount != demandPathCount & dualLoopObjs.Any())
+            if (supplyPathCount < demandPathCount & dualLoopObjs.Any())
             {
                 AddRuntimeMessage(GH_RuntimeMessageLevel.Error, $"Dual loop object [{dualLoopObjs.First().GetType().Name}] in supply side cannot be auto-duplicated. \nIt is because the data structure of supply side doesn't match demand side's. \nPlease use Ironbug_duplicate to duplicate {demandPathCount} objects, and match demand input's data structure.");
                 return;
diff --git a/src/Ironbug.Grasshopper/Component/Ironbug/Ironbug_PlantLoop.cs b/src/Ironbug.Grasshopper/Component/Ironbug/Ironbug_PlantLoop.cs
index 12168a95..e14c7ae0 100644
--- a/src/Ironbug.Grasshopper/Component/Ironbug/Ironbug_PlantLoop.cs
+++ b/src/Ironbug.Grasshopper/Component/Ironbug/Ironbug_PlantLoop.cs
@@ -44,15 +44,6 @@ protected override void SolveInstance(IGH_DataAccess DA)
             DA.GetDataList(1, demandComs);
             DA.GetData(2, ref sizing);
 
-            //check if there is a dual loop object that cannot be duplicated.
-            var supplyPathCount = this.Params.Input[0].VolatileData.PathCount;
-            var demandPathCount = this.Params.Input[1].VolatileData.PathCount;
-            var dualLoopObjs = supplyComs.Where(_ => _ is HVAC.IIB_DualLoopObj);
-            if (supplyPathCount != demandPathCount & dualLoopObjs.Any())
-            {
-                AddRuntimeMessage(GH_RuntimeMessageLevel.Error, $"Dual loop object [{dualLoopObjs.First().GetType().Name}] in supply side cannot be auto-duplicated. \nIt is because the data structure of supply side doesn't match demand side's. \nPlease use Ironbug_duplicate to duplicate {demandPathCount} objects, and match demand input's data structure.");
-                return;
-            }
 
             var plant = new HVAC.IB_PlantLoop();
             foreach (var item in supplyComs)
diff --git a/src/Ironbug.Grasshopper/Component/Ironbug/Ironbug_PlantLoop_CW.cs b/src/Ironbug.Grasshopper/Component/Ironbug/Ironbug_PlantLoop_CW.cs
index fcbf4edf..8e3bb6f1 100644
--- a/src/Ironbug.Grasshopper/Component/Ironbug/Ironbug_PlantLoop_CW.cs
+++ b/src/Ironbug.Grasshopper/Component/Ironbug/Ironbug_PlantLoop_CW.cs
@@ -47,15 +47,6 @@ protected override void SolveInstance(IGH_DataAccess DA)
             DA.GetDataList(1, demandComs);
             DA.GetData(2, ref sizing);
 
-            //check if there is a dual loop object that cannot be duplicated.
-            var supplyPathCount = this.Params.Input[0].VolatileData.PathCount;
-            var demandPathCount = this.Params.Input[1].VolatileData.PathCount;
-            var dualLoopObjs = supplyComs.Where(_ => _ is HVAC.IIB_DualLoopObj);
-            if (supplyPathCount != demandPathCount & dualLoopObjs.Any())
-            {
-                AddRuntimeMessage(GH_RuntimeMessageLevel.Error, $"Dual loop object [{dualLoopObjs.First().GetType().Name}] in supply side cannot be auto-duplicated. \nIt is because the data structure of supply side doesn't match demand side's. \nPlease use Ironbug_duplicate to duplicate {demandPathCount} objects, and match demand input's data structure.");
-                return;
-            }
 
             var plant = new HVAC.IB_PlantLoop();
             var plantFields = HVAC.IB_PlantLoop_FieldSet.Value;
diff --git a/src/Ironbug.Grasshopper/Component/Ironbug/Ironbug_PlantLoop_DW.cs b/src/Ironbug.Grasshopper/Component/Ironbug/Ironbug_PlantLoop_DW.cs
index a134909f..c912cb8a 100644
--- a/src/Ironbug.Grasshopper/Component/Ironbug/Ironbug_PlantLoop_DW.cs
+++ b/src/Ironbug.Grasshopper/Component/Ironbug/Ironbug_PlantLoop_DW.cs
@@ -45,15 +45,6 @@ protected override void SolveInstance(IGH_DataAccess DA)
             DA.GetDataList(1, demandComs);
             DA.GetData(2, ref sizing);
 
-            //check if there is a dual loop object that cannot be duplicated.
-            var supplyPathCount = this.Params.Input[0].VolatileData.PathCount;
-            var demandPathCount = this.Params.Input[1].VolatileData.PathCount;
-            var dualLoopObjs = supplyComs.Where(_ => _ is HVAC.IIB_DualLoopObj);
-            if (supplyPathCount != demandPathCount & dualLoopObjs.Any())
-            {
-                AddRuntimeMessage(GH_RuntimeMessageLevel.Error, $"Dual loop object [{dualLoopObjs.First().GetType().Name}] in supply side cannot be auto-duplicated. \nIt is because the data structure of supply side doesn't match demand side's. \nPlease use Ironbug_duplicate to duplicate {demandPathCount} objects, and match demand input's data structure.");
-                return;
-            }
 
             var plant = new HVAC.IB_PlantLoop();
             var plantFields = HVAC.IB_PlantLoop_FieldSet.Value;
diff --git a/src/Ironbug.Grasshopper/Component/Ironbug/Ironbug_PlantLoop_HW.cs b/src/Ironbug.Grasshopper/Component/Ironbug/Ironbug_PlantLoop_HW.cs
index 1a7f596d..4b18c96c 100644
--- a/src/Ironbug.Grasshopper/Component/Ironbug/Ironbug_PlantLoop_HW.cs
+++ b/src/Ironbug.Grasshopper/Component/Ironbug/Ironbug_PlantLoop_HW.cs
@@ -46,15 +46,6 @@ protected override void SolveInstance(IGH_DataAccess DA)
             DA.GetDataList(1, demandComs);
             DA.GetData(2, ref sizing);
 
-            //check if there is a dual loop object that cannot be duplicated.
-            var supplyPathCount = this.Params.Input[0].VolatileData.PathCount;
-            var demandPathCount = this.Params.Input[1].VolatileData.PathCount;
-            var dualLoopObjs = supplyComs.Where(_ => _ is HVAC.IIB_DualLoopObj);
-            if (supplyPathCount != demandPathCount & dualLoopObjs.Any())
-            {
-                AddRuntimeMessage(GH_RuntimeMessageLevel.Error, $"Dual loop object [{dualLoopObjs.First().GetType().Name}] in supply side cannot be auto-duplicated. \nIt is because the data structure of supply side doesn't match demand side's. \nPlease use Ironbug_duplicate to duplicate {demandPathCount} objects, and match demand input's data structure.");
-                return;
-            }
 
             var plant = new HVAC.IB_PlantLoop();
             var plantFields = HVAC.IB_PlantLoop_FieldSet.Value;