Ventilation is often inferior in new, single family houses. Ventilationen ofta dalig i nybygga enbostadshus.

Ventilation measurements in new Swedish houses show that they seldom fulfill minimum requirements of 0.5 air changes per. hour applicable to specific housing classifications. Basic natural ventilation is often used. Discusses consequent problems including condensation and humidity, excess radon daughters and formaldehyde content in the room air. Notes future demands for systems to include heat exchangers.