diff --git a/src/data/configuratorData.js b/src/data/configuratorData.js
index 4fec079..3b529fa 100644
--- a/src/data/configuratorData.js
+++ b/src/data/configuratorData.js
@@ -42,181 +42,6 @@ export const tentShapes = [
   }
 ];
 
-export const tentSizes = [
-  // 60x60 tents
-  {
-    id: 'tent_60x60x140',
-    name: 'Basic 140cm',
-    description: 'Einsteigermodell',
-    price: 89.99,
-    image: '/assets/images/nopicture.jpg',
-    dimensions: '60x60x140cm',
-    coverage: '1-2 Pflanzen',
-    shapeId: '60x60',
-    height: 140
-  },
-  {
-    id: 'tent_60x60x160',
-    name: 'Premium 160cm',
-    description: 'Mehr Höhe für größere Pflanzen',
-    price: 109.99,
-    image: '/assets/images/nopicture.jpg',
-    dimensions: '60x60x160cm',
-    coverage: '1-2 Pflanzen',
-    shapeId: '60x60',
-    height: 160
-  },
-  // 80x80 tents
-  {
-    id: 'tent_80x80x160',
-    name: 'Standard 160cm',
-    description: 'Beliebtes Mittelklasse-Modell',
-    price: 129.99,
-    image: '/assets/images/nopicture.jpg',
-    dimensions: '80x80x160cm',
-    coverage: '2-4 Pflanzen',
-    shapeId: '80x80',
-    height: 160
-  },
-  {
-    id: 'tent_80x80x180',
-    name: 'Pro 180cm',
-    description: 'Extra Höhe für optimales Wachstum',
-    price: 149.99,
-    image: '/assets/images/nopicture.jpg',
-    dimensions: '80x80x180cm',
-    coverage: '2-4 Pflanzen',
-    shapeId: '80x80',
-    height: 180
-  },
-  // 100x100 tents
-  {
-    id: 'tent_100x100x180',
-    name: 'Professional 180cm',
-    description: 'Für anspruchsvolle Projekte',
-    price: 189.99,
-    image: '/assets/images/nopicture.jpg',
-    dimensions: '100x100x180cm',
-    coverage: '4-6 Pflanzen',
-    shapeId: '100x100',
-    height: 180
-  },
-  {
-    id: 'tent_100x100x200',
-    name: 'Expert 200cm',
-    description: 'Maximum an Wuchshöhe',
-    price: 219.99,
-    image: '/assets/images/nopicture.jpg',
-    dimensions: '100x100x200cm',
-    coverage: '4-6 Pflanzen',
-    shapeId: '100x100',
-    height: 200
-  },
-  // 120x60 tents
-  {
-    id: 'tent_120x60x160',
-    name: 'Rectangular 160cm',
-    description: 'Platzsparend und effizient',
-    price: 139.99,
-    image: '/assets/images/nopicture.jpg',
-    dimensions: '120x60x160cm',
-    coverage: '3-6 Pflanzen',
-    shapeId: '120x60',
-    height: 160
-  },
-  {
-    id: 'tent_120x60x180',
-    name: 'Rectangular Pro 180cm',
-    description: 'Optimale Raumausnutzung',
-    price: 169.99,
-    image: '/assets/images/nopicture.jpg',
-    dimensions: '120x60x180cm',
-    coverage: '3-6 Pflanzen',
-    shapeId: '120x60',
-    height: 180
-  }
-];
-
-export const lightTypes = [
-  {
-    id: 'led_quantum_board',
-    name: 'LED Quantum Board',
-    description: 'Energieeffizient, geringe Wärmeentwicklung',
-    price: 159.99,
-    image: '/assets/images/nopicture.jpg',
-    wattage: '240W',
-    coverage: 'Bis 100x100cm',
-    spectrum: 'Vollspektrum',
-    efficiency: 'Sehr hoch'
-  },
-  {
-    id: 'led_cob',
-    name: 'LED COB',
-    description: 'Hochintensive COB-LEDs',
-    price: 199.99,
-    image: '/assets/images/nopicture.jpg',
-    wattage: '300W',
-    coverage: 'Bis 120x120cm',
-    spectrum: 'Vollspektrum',
-    efficiency: 'Hoch'
-  },
-  {
-    id: 'hps_400w',
-    name: 'HPS 400W',
-    description: 'Bewährte Natriumdampflampe',
-    price: 89.99,
-    image: '/assets/images/nopicture.jpg',
-    wattage: '400W',
-    coverage: 'Bis 80x80cm',
-    spectrum: 'Blüte-optimiert',
-    efficiency: 'Mittel'
-  },
-  {
-    id: 'cmh_315w',
-    name: 'CMH 315W',
-    description: 'Keramik-Metallhalogenid',
-    price: 129.99,
-    image: '/assets/images/nopicture.jpg',
-    wattage: '315W',
-    coverage: 'Bis 90x90cm',
-    spectrum: 'Natürlich',
-    efficiency: 'Hoch'
-  }
-];
-
-export const ventilationTypes = [
-  {
-    id: 'basic_exhaust',
-    name: 'Basic Abluft-Set',
-    description: 'Lüfter + Aktivkohlefilter',
-    price: 79.99,
-    image: '/assets/images/nopicture.jpg',
-    airflow: '187 m³/h',
-    noiseLevel: '35 dB',
-    includes: ['Rohrventilator', 'Aktivkohlefilter', 'Aluflexrohr']
-  },
-  {
-    id: 'premium_ventilation',
-    name: 'Premium Klima-Set',
-    description: 'Komplette Klimakontrolle',
-    price: 159.99,
-    image: '/assets/images/nopicture.jpg',
-    airflow: '280 m³/h',
-    noiseLevel: '28 dB',
-    includes: ['EC-Lüfter', 'Aktivkohlefilter', 'Thermostat', 'Feuchtigkeitsmesser']
-  },
-  {
-    id: 'pro_climate',
-    name: 'Profi Klima-System',
-    description: 'Automatisierte Klimasteuerung',
-    price: 299.99,
-    image: '/assets/images/nopicture.jpg',
-    airflow: '420 m³/h',
-    noiseLevel: '25 dB',
-    includes: ['Digitaler Controller', 'EC-Lüfter', 'Aktivkohlefilter', 'Zu-/Abluft']
-  }
-];
-
 export const extras = [
   {
     id: 'ph_tester',
diff --git a/src/pages/GrowTentKonfigurator.js b/src/pages/GrowTentKonfigurator.js
index d6485dd..94a36ae 100644
--- a/src/pages/GrowTentKonfigurator.js
+++ b/src/pages/GrowTentKonfigurator.js
@@ -15,8 +15,8 @@ import {
   CircularProgress,
 } from '@mui/material';
 import ShoppingCartIcon from '@mui/icons-material/ShoppingCart';
-import { TentShapeSelector, ProductSelector, ExtrasSelector } from '../components/configurator/index.js';
-import { tentShapes, ventilationTypes, extras } from '../data/configuratorData.js';
+import { TentShapeSelector, ExtrasSelector } from '../components/configurator/index.js';
+import { tentShapes, extras } from '../data/configuratorData.js';
 
 function setCachedCategoryData(categoryId, data) {
   if (!window.productCache) {
@@ -312,6 +312,58 @@ class GrowTentKonfigurator extends Component {
     return this.filterLampsByTentSize(shapeId, cachedData.products, cachedData.attributes);
   }
 
+  // Get ventilation products for selected tent shape
+  getVentilationForTentShape(shapeId) {
+    const cachedData = getCachedCategoryData('Abluft-sets');
+    if (!cachedData || !cachedData.products || !cachedData.attributes) {
+      console.log('No cached ventilation data available');
+      return [];
+    }
+
+    return this.filterVentilationByTentSize(shapeId, cachedData.products, cachedData.attributes);
+  }
+
+  // Filter ventilation by tent size using "passend für Zelt" attribute
+  filterVentilationByTentSize(tentShape, products, attributes) {
+    if (!products || !attributes || !tentShape) return [];
+
+    console.log('Filtering ventilation for tent shape:', tentShape);
+    console.log('Available ventilation products:', products.length);
+    console.log('Available ventilation attributes:', attributes.length);
+
+    // Group attributes by product ID and attribute name
+    const attributesByProduct = {};
+    attributes.forEach(attr => {
+      if (!attributesByProduct[attr.kArtikel]) {
+        attributesByProduct[attr.kArtikel] = {};
+      }
+      attributesByProduct[attr.kArtikel][attr.cName] = attr.cWert;
+    });
+
+    // Filter products by matching tent size in "passend für Zelt" attribute
+    const matchingProducts = products.filter(product => {
+      const attrs = attributesByProduct[product.id];
+      if (!attrs) return false;
+
+      // Check "passend für Zelt" attribute
+      const tentSizeAttr = attrs['passend für Zelt'];
+      if (!tentSizeAttr) return false;
+
+      // Check if tent size matches
+      const sizeMatch = tentSizeAttr === tentShape;
+      
+      // Check availability - only show products that are available for delivery
+      const isAvailable = (product.available > 0) || (product.availableSupplier === 1);
+
+      console.log(`Ventilation Product ${product.id}: tentSize=${tentSizeAttr}, match=${sizeMatch}, available=${isAvailable}`);
+
+      return sizeMatch && isAvailable;
+    });
+
+    console.log('Filtered ventilation:', matchingProducts.length);
+    return matchingProducts;
+  }
+
   // Helper function to generate coverage descriptions
   getCoverageDescription(width, depth) {
     const area = width * depth;
@@ -423,8 +475,9 @@ class GrowTentKonfigurator extends Component {
     
     // Add ventilation price
     if (selectedVentilationType) {
-      const ventilation = ventilationTypes.find(v => v.id === selectedVentilationType);
-      if (ventilation) {
+      const availableVentilation = this.getVentilationForTentShape(this.state.selectedTentShape);
+      const ventilation = availableVentilation.find(v => v.id === selectedVentilationType);
+      if (ventilation && ventilation.price) {
         total += ventilation.price;
         itemCount++;
       }
@@ -495,8 +548,9 @@ class GrowTentKonfigurator extends Component {
     }
     
     if (selectedVentilationType) {
-      const ventilation = ventilationTypes.find(v => v.id === selectedVentilationType);
-      if (ventilation) {
+      const availableVentilation = this.getVentilationForTentShape(this.state.selectedTentShape);
+      const ventilation = availableVentilation.find(v => v.id === selectedVentilationType);
+      if (ventilation && ventilation.price) {
         originalTotal += ventilation.price;
         itemCount++;
       }
@@ -801,17 +855,128 @@ class GrowTentKonfigurator extends Component {
   }
 
   renderVentilationSection() {
-    const { selectedVentilationType } = this.state;
+    const { selectedVentilationType, selectedTentShape } = this.state;
     
+    if (!selectedTentShape) {
+      return (
+        <Box sx={{ mt: 4 }}>
+          <Typography variant="h2" component="h2" gutterBottom sx={{ color: '#2e7d32', fontWeight: 'bold' }}>
+            4. Belüftung auswählen
+          </Typography>
+          <Typography variant="body2" color="text.secondary">
+            Bitte wählen Sie zuerst eine Zeltgröße aus.
+          </Typography>
+        </Box>
+      );
+    }
+
+    // Get real ventilation products for selected tent shape
+    const availableVentilation = this.getVentilationForTentShape(selectedTentShape);
+    const cachedData = getCachedCategoryData('Abluft-sets');
+
+    if (!cachedData) {
+      return (
+        <Box sx={{ mt: 4 }}>
+          <Typography variant="h2" component="h2" gutterBottom sx={{ color: '#2e7d32', fontWeight: 'bold' }}>
+            4. Belüftung auswählen - {selectedTentShape}
+          </Typography>
+          <Typography variant="body2" color="text.secondary">
+            Lade Belüftungs-Produkte...
+          </Typography>
+        </Box>
+      );
+    }
+
+    if (availableVentilation.length === 0) {
+      return (
+        <Box sx={{ mt: 4 }}>
+          <Typography variant="h2" component="h2" gutterBottom sx={{ color: '#2e7d32', fontWeight: 'bold' }}>
+            4. Belüftung auswählen - {selectedTentShape}
+          </Typography>
+          <Typography variant="body2" color="text.secondary">
+            Keine passenden Belüftung für Zeltgröße {selectedTentShape} verfügbar.
+          </Typography>
+        </Box>
+      );
+    }
+
     return (
-      <ProductSelector
-        products={ventilationTypes}
-        selectedValue={selectedVentilationType}
-        onSelect={this.handleVentilationSelect}
-        productType="ventilation"
-        title="4. Belüftung auswählen"
-        gridSize={{ xs: 12, md: 4 }}
-      />
+      <Box sx={{ mt: 4 }}>
+        <Typography variant="h2" component="h2" gutterBottom sx={{ color: '#2e7d32', fontWeight: 'bold' }}>
+          4. Belüftung auswählen - {selectedTentShape}
+        </Typography>
+        <Grid container spacing={2}>
+          {availableVentilation.map((ventilation) => (
+            <Grid item xs={12} sm={6} md={4} key={ventilation.id}>
+              <Box sx={{
+                width: { xs: '100%', sm: '250px' },
+                height: '100%',
+                display: 'flex',
+                flexDirection: 'column',
+                borderRadius: '8px',
+                overflow: 'hidden',
+                cursor: 'pointer',
+                border: '2px solid',
+                borderColor: selectedVentilationType === ventilation.id ? '#2e7d32' : '#e0e0e0',
+                backgroundColor: selectedVentilationType === ventilation.id ? '#f1f8e9' : '#ffffff',
+                '&:hover': {
+                  boxShadow: 6,
+                  borderColor: '#2e7d32'
+                },
+                transition: 'all 0.3s ease'
+              }}
+              onClick={() => this.handleVentilationSelect(ventilation.id)}
+              >
+                {/* Image */}
+                <Box sx={{ height: 200, display: 'flex', alignItems: 'center', justifyContent: 'center', overflow: 'hidden' }}>
+                  {this.renderTentImage(ventilation)}
+                </Box>
+
+                {/* Content */}
+                <Box sx={{ p: 2, flexGrow: 1, display: 'flex', flexDirection: 'column' }}>
+                  {/* Name */}
+                  <Typography variant="h6" gutterBottom sx={{ fontWeight: 'bold' }}>
+                    {ventilation.name}
+                  </Typography>
+
+                  {/* Price with VAT */}
+                  <Typography variant="h6" sx={{ 
+                    color: '#2e7d32', 
+                    fontWeight: 'bold', 
+                    mt: 2,
+                    display: 'flex', 
+                    alignItems: 'center', 
+                    gap: 1,
+                    flexWrap: 'wrap'
+                  }}>
+                    <span>{ventilation.price ? new Intl.NumberFormat('de-DE', {
+                      style: 'currency',
+                      currency: 'EUR'
+                    }).format(ventilation.price) : 'Kein Preis'}</span>
+                    {ventilation.vat && (
+                      <small style={{ color: '#77aa77', fontSize: '0.6em' }}>
+                        (incl. {ventilation.vat}% MwSt.,*)
+                      </small>
+                    )}
+                  </Typography>
+
+                  {/* Selection Indicator */}
+                  {selectedVentilationType === ventilation.id && (
+                    <Typography variant="body2" sx={{ 
+                      color: '#2e7d32', 
+                      fontWeight: 'bold',
+                      mt: 1,
+                      textAlign: 'center'
+                    }}>
+                      ✓ Ausgewählt
+                    </Typography>
+                  )}
+                </Box>
+              </Box>
+            </Grid>
+          ))}
+        </Grid>
+      </Box>
     );
   }
 
@@ -843,7 +1008,8 @@ class GrowTentKonfigurator extends Component {
     }
     const availableLamps = this.state.selectedTentShape ? this.getLampsForTentShape(this.state.selectedTentShape) : [];
     const selectedLight = availableLamps.find(l => l.id === selectedLightType);
-    const selectedVentilation = ventilationTypes.find(v => v.id === selectedVentilationType);
+    const availableVentilation = this.state.selectedTentShape ? this.getVentilationForTentShape(this.state.selectedTentShape) : [];
+    const selectedVentilation = availableVentilation.find(v => v.id === selectedVentilationType);
     const selectedExtrasItems = extras.filter(e => selectedExtras.includes(e.id));
     const savingsInfo = this.calculateSavings();