diff --git a/src/configs/diffuser.json b/src/configs/diffuser.json
new file mode 100644
index 0000000..76b6454
--- /dev/null
+++ b/src/configs/diffuser.json
@@ -0,0 +1,111 @@
+{
+  "general": {
+    "name": {
+      "default": "Diffuser",
+      "rules": {
+        "type": "string",
+        "description": "A human-readable name for this diffuser zone."
+      }
+    },
+    "id": {
+      "default": null,
+      "rules": {
+        "type": "string",
+        "nullable": true,
+        "description": "Unique identifier for this diffuser node."
+      }
+    },
+    "unit": {
+      "default": "Nm3/h",
+      "rules": {
+        "type": "string",
+        "description": "Default airflow unit for this diffuser."
+      }
+    },
+    "logging": {
+      "logLevel": {
+        "default": "info",
+        "rules": {
+          "type": "enum",
+          "values": [
+            { "value": "debug", "description": "Verbose diagnostic messages." },
+            { "value": "info", "description": "General informational messages." },
+            { "value": "warn", "description": "Warning messages." },
+            { "value": "error", "description": "Error level messages only." }
+          ]
+        }
+      },
+      "enabled": {
+        "default": true,
+        "rules": {
+          "type": "boolean",
+          "description": "Enable or disable logging."
+        }
+      }
+    }
+  },
+  "functionality": {
+    "softwareType": {
+      "default": "diffuser",
+      "rules": {
+        "type": "string",
+        "description": "Software type identifier for parent-child registration."
+      }
+    },
+    "role": {
+      "default": "Aeration diffuser",
+      "rules": {
+        "type": "string",
+        "description": "Describes the functional role of this node."
+      }
+    },
+    "positionVsParent": {
+      "default": "atEquipment",
+      "rules": {
+        "type": "enum",
+        "values": [
+          { "value": "upstream", "description": "Upstream of parent equipment." },
+          { "value": "atEquipment", "description": "At equipment level." },
+          { "value": "downstream", "description": "Downstream of parent equipment." }
+        ]
+      }
+    }
+  },
+  "diffuser": {
+    "number": {
+      "default": 1,
+      "rules": {
+        "type": "number",
+        "description": "Sequential diffuser zone number."
+      }
+    },
+    "elements": {
+      "default": 1,
+      "rules": {
+        "type": "number",
+        "description": "Number of diffuser elements in the zone."
+      }
+    },
+    "density": {
+      "default": 2.4,
+      "rules": {
+        "type": "number",
+        "description": "Installed diffuser density per square meter."
+      }
+    },
+    "waterHeight": {
+      "default": 0,
+      "rules": {
+        "type": "number",
+        "description": "Water column height above the diffuser."
+      }
+    },
+    "alfaFactor": {
+      "default": 0.7,
+      "rules": {
+        "type": "number",
+        "description": "Alpha factor used for oxygen transfer correction."
+      }
+    }
+  }
+}
diff --git a/test/configManager.test.js b/test/configManager.test.js
index 1198e4b..63c8995 100644
--- a/test/configManager.test.js
+++ b/test/configManager.test.js
@@ -56,6 +56,7 @@ describe('ConfigManager', () => {
     it('should include known config names without .json extension', () => {
       const configs = cm.getAvailableConfigs();
       expect(configs).toContain('baseConfig');
+      expect(configs).toContain('diffuser');
       expect(configs).toContain('measurement');
     });