Electricity efficient ventilation in dwellings

The project constituted the third and final phase of a project programme that analysed demandcontrolled ventilation in blocks of flats. Project measurements in selected test flats where the influx of external air was controlled by flat humidity showed that the influx of external air is greater than in mechanically ventilated flats and that electricity consumption in the ventilation system is reduced. Although the building regulation currently prevents the use of demand-controlled ventilation, users can benefit from using passive, humidity-controlled external-air valves as long as their basic settings observe the regulation.