diff --git a/src/main/java/gregtech/common/metatileentities/multi/electric/MetaTileEntityCleanroom.java b/src/main/java/gregtech/common/metatileentities/multi/electric/MetaTileEntityCleanroom.java
index 2017d22a48d..59647058a80 100644
--- a/src/main/java/gregtech/common/metatileentities/multi/electric/MetaTileEntityCleanroom.java
+++ b/src/main/java/gregtech/common/metatileentities/multi/electric/MetaTileEntityCleanroom.java
@@ -207,7 +207,6 @@ protected static TraceabilityPredicate doorPredicate() {
         return new TraceabilityPredicate(blockWorldState -> blockWorldState.getBlockState().getBlock() instanceof BlockDoor);
     }
 
-    // protected to allow easy addition of addon "cleanrooms"
     @Nonnull
     protected TraceabilityPredicate innerPredicate() {
         return new TraceabilityPredicate(blockWorldState -> {
@@ -218,16 +217,13 @@ protected TraceabilityPredicate innerPredicate() {
 
             MetaTileEntity metaTileEntity = ((MetaTileEntityHolder) tileEntity).getMetaTileEntity();
 
-            // blacklisted machines: mufflers, all generators, other cleanrooms
-            if (metaTileEntity instanceof IMufflerHatch)
-                return false;
-            if (metaTileEntity instanceof SimpleGeneratorMetaTileEntity)
-                return false;
-            if (metaTileEntity instanceof FuelMultiblockController)
-                return false;
+            // always ban other cleanrooms, can cause problems otherwise
             if (metaTileEntity instanceof ICleanroomProvider)
                 return false;
 
+            if (isMachineBanned(metaTileEntity))
+                return false;
+
             // the machine does not need a cleanroom, so do nothing more
             if (!(metaTileEntity instanceof ICleanroomReceiver))
                 return true;
@@ -240,6 +236,18 @@ protected TraceabilityPredicate innerPredicate() {
         });
     }
 
+    protected boolean isMachineBanned(MetaTileEntity metaTileEntity) {
+        // blacklisted machines: mufflers and all generators
+        if (metaTileEntity instanceof IMufflerHatch)
+            return true;
+        if (metaTileEntity instanceof SimpleGeneratorMetaTileEntity)
+            return true;
+        if (metaTileEntity instanceof FuelMultiblockController)
+            return true;
+
+        return false;
+    }
+
     @Override
     protected void addDisplayText(List<ITextComponent> textList) {
         super.addDisplayText(textList);