diff --git a/hub/exports/building_energy/idf.py b/hub/exports/building_energy/idf.py
index 058a4e8d..5ccd7a37 100644
--- a/hub/exports/building_energy/idf.py
+++ b/hub/exports/building_energy/idf.py
@@ -536,6 +536,7 @@ class Idf:
             self._add_zone(thermal_zone, building.name)
             self._add_heating_system(thermal_zone, building.name)
             self._add_infiltration(thermal_zone, building.name)
+            self._add_ventilation(thermal_zone, building.name)
             self._add_occupancy(thermal_zone, building.name)
             self._add_lighting(thermal_zone, building.name)
             self._add_appliances(thermal_zone, building.name)