diff --git a/app/cara.ipynb b/app/cara.ipynb
index 906bf165..931d3197 100644
--- a/app/cara.ipynb
+++ b/app/cara.ipynb
@@ -42,7 +42,8 @@
     "    \"\"\"\n",
     "    model = cara.models.Model(\n",
     "        room=cara.models.Room(volume=volume),\n",
-    "        ventilation=cara.models.Ventilation(),\n",
+    "        ventilation=cara.models.PeriodicWindow(period=120, duration=120, inside_temp=293, outside_temp=283,\n",
+    "                                               window_height=1.6, opening_length=0.6, cd_b=0.6),\n",
     "        infected=cara.models.InfectedPerson(\n",
     "            virus=cara.models.Virus.types['SARS_CoV_2'],\n",
     "            present_times=((0, 4), (5, 8)),\n",
@@ -145,7 +146,7 @@
    ],
    "source": [
     "ventilation_widgets = {\n",
-    "    'Natural': widgets.Label('Currently hard-coded to 514.74 / volume'),\n",
+    "    'Natural': widgets.Label('Currently hard-coded to window-example from mathematica notebook'),\n",
     "    'other': widgets.Label('Not yet implemented.')\n",
     "}\n",
     "for name, widget in ventilation_widgets.items():\n",
@@ -288,4 +289,4 @@
  },
  "nbformat": 4,
  "nbformat_minor": 4
-}
+}
\ No newline at end of file