Details on Specific Air Permeability (50 Pa)

Information on the Specific air permeability (50 Pa) section of the general heat load data.

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Module overview ➤ Heat load ➤ Project level ➤ General heat load data ➤ Specific air permeability (50 Pa)

Specific air permeability (50 Pa)

Click to select a category from the standard or enter a free value. This input field is deactivated as soon as the checkbox Air change n(50) measured is activated.

Air change n(50) measured

Enabled: The Specific air permeability input field is deactivated. If measured values for air change from the blower door test are available, the measured air change for 50 Pa inside-outside pressure difference can be entered here. The following measurement conditions are assumed:

  • Small openings were closed during the measurement

  • Internal volume was determined according to EN ISO 9972, method B

    The value in the Specific air permeability n(50) field is calculated using this value.

Area of small openings

If corresponding measured values are available, e.g. from a blower door test, the area of small openings can be entered here. The value is taken into account when calculating the air permeability.