Conventional techniques for the measurement of adventitious leakage of building envelopes are basedon steady pressurisation at high pressures (e.g. 50 Pa) that are not normally encountered with naturalor mechanical ventilation. It is the leakage at low pressures (e.g. 4 Pa) that is of interest and it is shownthat the conventional technique leads to large uncertainty in the low-pressure leakage. Ideally apressurisation of 4 Pa should be used, but with the conventional technique the uncertainty due to windeffects is unacceptably large.
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