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External air volume flow rate into the room (i) through the building envelope (taking into account natural infiltration and, where applicable, through external air terminal devices) |
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Air flow rate into the ventilation zone (z) due to additional infiltration |
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External air volume flow rate into the ventilation zone (z) through the building envelope |
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External air volume flow rate into the room (i) through LeaksExternal air terminal devices |
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Orientation factor; =2 (gemäß B.2.14) |
Significance for the calculation
The value influences the design ventilation heat loss of the room 
and is a component of EN 12831-1:2017, Equation 17.
