Details on Ventilation
Information on the Ventilation section of the general heat load data.
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Air change n(50)
The hourly air permeability for the entire building at an inside - outside difference in pressure of 50 Pa. Click 
to open a dialog for the selection of categories according to the German supplement.
Drop-down list: Selection of the ventilation system
Select the type of ventilation system as the default setting for the project. This default setting is initially adopted for each ventilation zone. You can make a different specification in each ventilation zone. The selection of ventilation systems is based on the Ventilation module. If the Ventilation module is activated, the settings between the two modules are automatically synchronized. If you change the settings and different settings were made in ventilation zones or rooms, you will be asked whether the new setting should be applied to all rooms. If different ventilation systems are selected in the individual rooms, the display of the ventilation system at project level (general heat load data) depends on which system is most frequently used in the rooms.
Eta value (heat recovery)
Enter the efficiency of the heat recovery system in percent. It is only used if a supply and extract air system is available. The efficiency is then used to calculate the supply air temperature of supply air rooms.
Zeta
Simultaneously effective percentage of ventilation heat loss by infiltration. 0.5 is the default value, but can be modified. Click to reset a modified value back to 0.5.
Shaft type building
Enabled: For higher buildings the height correction factors are determined according to DIN 4701. The determined value is compared with the value according to EN 12831 and the higher value is considered in the calculation.
Check air volume balance
Enabled: An air volume balance is created for the entire building and displayed in the log if it is unbalanced.
Disabled: No air volume balance is created and no message appears in the log.