Openings tab in model data
DesignBuilder doors are opaque and are added to the model by navigating to the appropriate surface and checking the 'Door fitted' option. This adds a single door replacing one of the windows. Alternatively, for more control over the placement position of the doors, you can go to surface level and draw the doors using the Draw Door command. On surfaces where custom openings have been defined, any changes to door layout model data on the Opening tab is ignored.
Note: if you have drawn custom doors at the surface level then these will be used even if the Doors fitted checkbox is not checked. The Doors fitted checkbox only controls the automatic generation of doors, not their use in the calculations.
Airflow through Doors: Doors positioned on external walls only have an effect on airflow in Simulation calculations when the Natural ventilation building model option is set to Calculated. They have no effect on airflow in Heating and Cooling Design calculations. Doors positioned on internal partition walls are used to mix the air between the two adjacent zones when the Scheduled Natural ventilation building model option is set. They also provide an air flow path when the Calculated option is set.