Measurement of the tightness of a building with its own ventilation system. Tiiviyden mittaus rakennusken omalla ilmanvachtojarjestelmalla

Shows that the leakage test in most buildings with mechanical ventilation may be performed with the ventilation system itself with only a slight reduction in the accuracy of the measurements. Using fans in the ventilation system, the pressure difference inside/outside may often reach a measurable value of 5-10 pa. If such a pressure difference is not obtained, the leakage exceeds allowable values and the building should be tightened. Before measuring, all of the supply air openings in outer core of the building should be closed and taped. All doors inside the apartment should be open. The exhaust air flow and the pressure difference inside/outside is measured in every apartment and the results are extrapolated to a reference pressure. Measurements should becarried out in calm weather conditions.