Preliminary investigation into ventilation efficiency. Forundersogelse vedrorende ventilationseffektivitet.

The primary aim of the project is to describe and document a measurement method suitable for checking whether minimum requirements for ventilation efficiency are fulfilled after a ventilation system has been regulated. The project concentrates on occupied areas with mechanical ventilation such as dwellings,offices and schools. Excludes industrial buildings since special conditions such as ventilation rates, polluting processes and local extraction apply to these. Defines ventilation efficiency, describes equipment and measurement with CO2, N2O, SF6, Kr85. Table notes minimum tracer gas concentrations required for determining air change rates, diagrams note efficiencies in different rooms under different conditions.