On the estimate and reduction of the zero-flow pressure estimation uncertainty in fan pressurization measurement

Building airtightness is of foremost importance because of its impact on global energy consumption, but also on occupant’s comfort, dimensioning of ventilation systems, hygrothermal behaviour, fire safety, etc. This building characteristic is usually measured with the fan pressurization method, following ISO 9972:2015 standard. This method requires to assume that the pressure difference due to wind and stack effect, called the zero-flow pressure difference, is constant during the test and that its value is the average of pre- and post-test measurements. ThisÂ