diff --git a/src/pages/GrowTentKonfigurator.js b/src/pages/GrowTentKonfigurator.js
index 94a36ae..419b919 100644
--- a/src/pages/GrowTentKonfigurator.js
+++ b/src/pages/GrowTentKonfigurator.js
@@ -116,6 +116,15 @@ class GrowTentKonfigurator extends Component {
     if (prevState.selectedTentShape !== this.state.selectedTentShape && this.state.selectedTentShape !== prevState.selectedTentShape) {
       this.setState({ selectedTentSize: '' });
     }
+
+    // Reset ventilation selection if current selection is not deliverable for new tent shape
+    if (prevState.selectedTentShape !== this.state.selectedTentShape && this.state.selectedVentilationType) {
+      const availableVentilation = this.getVentilationForTentShape(this.state.selectedTentShape);
+      const currentVentilation = availableVentilation.find(v => v.id === this.state.selectedVentilationType);
+      if (!currentVentilation || !currentVentilation.isDeliverable) {
+        this.setState({ selectedVentilationType: '' });
+      }
+    }
     
     // Recalculate total price when selections change
     if (
@@ -341,6 +350,7 @@ class GrowTentKonfigurator extends Component {
     });
 
     // Filter products by matching tent size in "passend für Zelt" attribute
+    // Include all size-matching products, but mark availability status
     const matchingProducts = products.filter(product => {
       const attrs = attributesByProduct[product.id];
       if (!attrs) return false;
@@ -349,18 +359,22 @@ class GrowTentKonfigurator extends Component {
       const tentSizeAttr = attrs['passend für Zelt'];
       if (!tentSizeAttr) return false;
 
-      // Check if tent size matches
+      // Only filter by tent size match, not by availability
       const sizeMatch = tentSizeAttr === tentShape;
-      
-      // Check availability - only show products that are available for delivery
+
+      console.log(`Ventilation Product ${product.id}: tentSize=${tentSizeAttr}, match=${sizeMatch}`);
+
+      return sizeMatch;
+    }).map(product => {
+      // Add availability flag to each product for UI rendering
       const isAvailable = (product.available > 0) || (product.availableSupplier === 1);
-
-      console.log(`Ventilation Product ${product.id}: tentSize=${tentSizeAttr}, match=${sizeMatch}, available=${isAvailable}`);
-
-      return sizeMatch && isAvailable;
+      return {
+        ...product,
+        isDeliverable: isAvailable
+      };
     });
 
-    console.log('Filtered ventilation:', matchingProducts.length);
+    console.log('Filtered ventilation (including non-deliverable):', matchingProducts.length);
     return matchingProducts;
   }
 
@@ -477,7 +491,7 @@ class GrowTentKonfigurator extends Component {
     if (selectedVentilationType) {
       const availableVentilation = this.getVentilationForTentShape(this.state.selectedTentShape);
       const ventilation = availableVentilation.find(v => v.id === selectedVentilationType);
-      if (ventilation && ventilation.price) {
+      if (ventilation && ventilation.price && ventilation.isDeliverable) {
         total += ventilation.price;
         itemCount++;
       }
@@ -550,7 +564,7 @@ class GrowTentKonfigurator extends Component {
     if (selectedVentilationType) {
       const availableVentilation = this.getVentilationForTentShape(this.state.selectedTentShape);
       const ventilation = availableVentilation.find(v => v.id === selectedVentilationType);
-      if (ventilation && ventilation.price) {
+      if (ventilation && ventilation.price && ventilation.isDeliverable) {
         originalTotal += ventilation.price;
         itemCount++;
       }
@@ -915,18 +929,53 @@ class GrowTentKonfigurator extends Component {
                 flexDirection: 'column',
                 borderRadius: '8px',
                 overflow: 'hidden',
-                cursor: 'pointer',
+                cursor: ventilation.isDeliverable ? 'pointer' : 'not-allowed',
                 border: '2px solid',
                 borderColor: selectedVentilationType === ventilation.id ? '#2e7d32' : '#e0e0e0',
                 backgroundColor: selectedVentilationType === ventilation.id ? '#f1f8e9' : '#ffffff',
-                '&:hover': {
+                opacity: ventilation.isDeliverable ? 1 : 0.5,
+                filter: ventilation.isDeliverable ? 'none' : 'grayscale(50%)',
+                '&:hover': ventilation.isDeliverable ? {
                   boxShadow: 6,
                   borderColor: '#2e7d32'
-                },
-                transition: 'all 0.3s ease'
+                } : {},
+                transition: 'all 0.3s ease',
+                position: 'relative'
+              }}
+              onClick={() => {
+                if (ventilation.isDeliverable) {
+                  this.handleVentilationSelect(ventilation.id);
+                }
               }}
-              onClick={() => this.handleVentilationSelect(ventilation.id)}
               >
+                {/* Non-deliverable overlay */}
+                {!ventilation.isDeliverable && (
+                  <Box sx={{
+                    position: 'absolute',
+                    top: 0,
+                    left: 0,
+                    right: 0,
+                    bottom: 0,
+                    display: 'flex',
+                    alignItems: 'center',
+                    justifyContent: 'center',
+                    backgroundColor: 'rgba(255, 255, 255, 0.8)',
+                    zIndex: 1,
+                    flexDirection: 'column'
+                  }}>
+                    <Typography variant="h6" sx={{ 
+                      color: '#d32f2f', 
+                      fontWeight: 'bold',
+                      textAlign: 'center',
+                      backgroundColor: 'rgba(255, 255, 255, 0.9)',
+                      p: 1,
+                      borderRadius: 1
+                    }}>
+                      Nicht lieferbar
+                    </Typography>
+                  </Box>
+                )}
+
                 {/* Image */}
                 <Box sx={{ height: 200, display: 'flex', alignItems: 'center', justifyContent: 'center', overflow: 'hidden' }}>
                   {this.renderTentImage(ventilation)}
@@ -935,13 +984,16 @@ class GrowTentKonfigurator extends Component {
                 {/* Content */}
                 <Box sx={{ p: 2, flexGrow: 1, display: 'flex', flexDirection: 'column' }}>
                   {/* Name */}
-                  <Typography variant="h6" gutterBottom sx={{ fontWeight: 'bold' }}>
+                  <Typography variant="h6" gutterBottom sx={{ 
+                    fontWeight: 'bold',
+                    color: ventilation.isDeliverable ? 'inherit' : '#999'
+                  }}>
                     {ventilation.name}
                   </Typography>
 
                   {/* Price with VAT */}
                   <Typography variant="h6" sx={{ 
-                    color: '#2e7d32', 
+                    color: ventilation.isDeliverable ? '#2e7d32' : '#999', 
                     fontWeight: 'bold', 
                     mt: 2,
                     display: 'flex', 
@@ -954,14 +1006,14 @@ class GrowTentKonfigurator extends Component {
                       currency: 'EUR'
                     }).format(ventilation.price) : 'Kein Preis'}</span>
                     {ventilation.vat && (
-                      <small style={{ color: '#77aa77', fontSize: '0.6em' }}>
+                      <small style={{ color: ventilation.isDeliverable ? '#77aa77' : '#999', fontSize: '0.6em' }}>
                         (incl. {ventilation.vat}% MwSt.,*)
                       </small>
                     )}
                   </Typography>
 
                   {/* Selection Indicator */}
-                  {selectedVentilationType === ventilation.id && (
+                  {selectedVentilationType === ventilation.id && ventilation.isDeliverable && (
                     <Typography variant="body2" sx={{ 
                       color: '#2e7d32', 
                       fontWeight: 'bold',
@@ -1009,7 +1061,7 @@ class GrowTentKonfigurator extends Component {
     const availableLamps = this.state.selectedTentShape ? this.getLampsForTentShape(this.state.selectedTentShape) : [];
     const selectedLight = availableLamps.find(l => l.id === selectedLightType);
     const availableVentilation = this.state.selectedTentShape ? this.getVentilationForTentShape(this.state.selectedTentShape) : [];
-    const selectedVentilation = availableVentilation.find(v => v.id === selectedVentilationType);
+    const selectedVentilation = availableVentilation.find(v => v.id === selectedVentilationType && v.isDeliverable);
     const selectedExtrasItems = extras.filter(e => selectedExtras.includes(e.id));
     const savingsInfo = this.calculateSavings();