Sustained efforts to conserve energy during the last 15 years have taken place at the expense of the indoor environmental quality. Ventilation air volume has been reduced to a minimum. The use of new materials, substances and equipment which emit gases, vapours, fibres and other pollutants into indoor air are and additional reason for the increasing frequency of complaints about the indoor environment. If air quality is improved by increasing air volume, the energy demand will increase - and extended initial costs will rise.
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