diff --git a/hub/exports/building_energy/idf.py b/hub/exports/building_energy/idf.py
index 27f678fd..058a4e8d 100644
--- a/hub/exports/building_energy/idf.py
+++ b/hub/exports/building_energy/idf.py
@@ -150,7 +150,6 @@ class Idf:
                              Solar_Absorptance=layer.material.solar_absorptance,
                              Visible_Absorptance=layer.material.visible_absorptance
                              )
-
   @staticmethod
   def _create_infiltration_schedules(thermal_zone):
     _infiltration_schedules = []
@@ -177,6 +176,21 @@ class Idf:
       _infiltration_schedules.append(_schedule)
     return _infiltration_schedules
 
+  @staticmethod
+  def _create_ventilation_schedules(thermal_zone):
+    _ventilation_schedules = []
+    if thermal_zone.thermal_control is None:
+      return []
+    for hvac_availability_schedule in thermal_zone.thermal_control.hvac_availability_schedules:
+      _schedule = Schedule()
+      _schedule.type = cte.VENTILATION
+      _schedule.data_type = cte.FRACTION
+      _schedule.time_step = cte.HOUR
+      _schedule.time_range = cte.DAY
+      _schedule.day_types = copy.deepcopy(hvac_availability_schedule.day_types)
+      _ventilation_schedules = thermal_zone.thermal_control.hvac_availability_schedules
+    return _ventilation_schedules
+
   @staticmethod
   def _create_yearly_values_schedules(schedule_type, values):
     _schedule = Schedule()
@@ -279,7 +293,8 @@ class Idf:
   def _add_construction(self, thermal_boundary):
     for construction in self._idf.idfobjects[self._CONSTRUCTION]:
       if thermal_boundary.parent_surface.vegetation is not None:
-        if construction.Name == f'{thermal_boundary.construction_name}_{thermal_boundary.parent_surface.vegetation.name}':
+        if construction.Name == f'{thermal_boundary.construction_name}_' \
+                                f'{thermal_boundary.parent_surface.vegetation.name}':
           return
       else:
         if construction.Name == thermal_boundary.construction_name:
@@ -335,8 +350,10 @@ class Idf:
         return thermostat
     return self._idf.newidfobject(self._THERMOSTAT,
                                   Name=thermostat_name,
-                                  Heating_Setpoint_Schedule_Name=f'Heating thermostat schedules {thermal_zone.usage_name}',
-                                  Cooling_Setpoint_Schedule_Name=f'Cooling thermostat schedules {thermal_zone.usage_name}')
+                                  Heating_Setpoint_Schedule_Name=
+                                  f'Heating thermostat schedules {thermal_zone.usage_name}',
+                                  Cooling_Setpoint_Schedule_Name=
+                                  f'Cooling thermostat schedules {thermal_zone.usage_name}')
 
   def _add_heating_system(self, thermal_zone, zone_name):
     for air_system in self._idf.idfobjects[self._IDEAL_LOAD_AIR_SYSTEM]:
@@ -422,19 +439,19 @@ class Idf:
                            )
 
   def _add_ventilation(self, thermal_zone, zone_name):
-    # for zone in self._idf.idfobjects["ZONE"]:
-    #  if zone.Name == f'{zone_name}_infiltration':
-    #    return
+    for zone in self._idf.idfobjects["ZONE"]:
+      if zone.Name == f'{zone_name}_ventilation':
+       return
     schedule = f'Ventilation schedules {thermal_zone.usage_name}'
-    # if schedule not in self._idf.idfobjects[self._HOURLY_SCHEDULE]:
-    #  return
+    if schedule not in self._idf.idfobjects[self._HOURLY_SCHEDULE]:
+      return
     # todo: revise ventilation with Pilar
     self._idf.newidfobject(self._VENTILATION,
                            Name=f'{zone_name}_ventilation',
                            Zone_or_ZoneList_Name=zone_name,
                            Schedule_Name=schedule,
-                           Design_Flow_Rate_Calculation_Method='Flow/Zone',
-                           Flow_Rate_per_Zone_Floor_Area=thermal_zone.infiltration_rate_system_off
+                           Design_Flow_Rate_Calculation_Method='AirChanges/Hour',
+                           Flow_Rate_per_Zone_Floor_Area=thermal_zone.mechanical_air_change
                            )
 
   def _add_dhw(self, thermal_zone, zone_name):
@@ -493,6 +510,8 @@ class Idf:
           if building.name in self._target_buildings or building.name in self._adjacent_buildings:
             _new_schedules = self._create_infiltration_schedules(thermal_zone)
             self._add_schedules(usage, 'Infiltration', _new_schedules)
+            _new_schedules2 = self._create_ventilation_schedules(thermal_zone)
+            self._add_schedules(usage, 'Ventilation', _new_schedules2)
             self._add_schedules(usage, 'Occupancy', thermal_zone.occupancy.occupancy_schedules)
             self._add_schedules(usage, 'HVAC AVAIL', thermal_zone.thermal_control.hvac_availability_schedules)
             self._add_schedules(usage, 'Heating thermostat', thermal_zone.thermal_control.heating_set_point_schedules)
@@ -654,7 +673,7 @@ class Idf:
             outside_boundary_condition = 'Ground'
             sun_exposure = 'NoSun'
             wind_exposure = 'NoWind'
-          if boundary.parent_surface.percentage_shared is not None and boundary.parent_surface.percentage_shared >= 0.5:
+          if boundary.parent_surface.percentage_shared is not None and boundary.parent_surface.percentage_shared > 0.5:
             outside_boundary_condition = 'Surface'
             outside_boundary_condition_object = boundary.parent_surface.name
             sun_exposure = 'NoSun'
diff --git a/hub/helpers/constants.py b/hub/helpers/constants.py
index 90690979..c4a933aa 100644
--- a/hub/helpers/constants.py
+++ b/hub/helpers/constants.py
@@ -158,6 +158,7 @@ OCCUPANCY = 'Occupancy'
 APPLIANCES = 'Appliances'
 HVAC_AVAILABILITY = 'HVAC Avail'
 INFILTRATION = 'Infiltration'
+VENTILATION = 'Ventilation'
 COOLING_SET_POINT = 'ClgSetPt'
 HEATING_SET_POINT = 'HtgSetPt'
 EQUIPMENT = 'Equipment'