ISO 9972:2015 pdf free

ISO 9972:2015 pdf free.Thermal performance of buildings一Determination of air permeability of buildings
There are two modes for this measurement procedure: depressurization or pressurization of a building or part of a building. Regardless of which mode is used, the air leakage of building envelope can be measured. The accuracy of this measurement procedure is largely dependent on the instrumentation and apparatus used and on the ambient conditions under which the data are taken.
NOTE 1 Pressurization means that the pressure inside the building is higher than outside. Depressurization means that the pressure inside the building is lower than outside.
NOTE 2 If the product of the indoor/outdoor air temperature difference, expressed in Kelvin, multiplied by the height, expressed in metres, of the building or measured part of the building gives a result greater than 250 mK, it is unlikely that a satisfactory zero-flow pressure difference can be obtained (see 5.3.3).
NOTE 3 If the wind speed near the ground exceeds 3 m/s or the meteorological wind speed exceeds 6 m/s or reaches 3 on the Beaufort scale, it is unlikely that a satisfactory zero-flow pressure difference can be obtained (see 5.3.3).
The extent of the building or part of the building measured depends on the purpose of the test and is defined as follows.
a) Normally, the part of the building measured includes all deliberately conditioned rooms (i.e. rooms that are intended to be directly or indirectly heated, cooled, and/or ventilated as a whole).
b) If the aim of the measurement is compliance with the air-tightness specification of a building code or standard and the measured extent is defined in this code or standard, the measured extent is defined as in this code or standard.
c) If the aim of the measurement is compliance with the air-tightness specification of a building code or standard and the measured extent is not defined in this code or standard, the measured extent is defined as in a).
d) In special cases, the measured extent can be defined in agreement with the client.
Individual parts of a building can be measured separately, e.g. in apartment buildings, each apartment can be measured individually. However, interpretation of results shall consider that air leakage measured in this way can include flow through leaks to adjacent parts of the building.
NOTE 1 It is possible that an apartment building meets air-tightness requirements, but that one or more individual apartments do not.
NOTE 2 Good practice requires measuring pressures induced in adjoining spaces, such as the attic and basement or adjacent apartments, since air flow into or out of these spaces can be induced by the test method. ISO 9972 pdf download.