Ventilation rate measurement.

Some guidelines on indoor-air quality specify a maximum allowable exposure to CO2. In a room ventilated by a mechanical extract system a control program on the CO2 concentration may, by anappropriate sampling strategy, supply information about the exhausted flowrate. This paper briefly outlines a simple analytical model for estimating the exhausted flowrate by measuring the CO2 concentration and keeping a record of the occupancy of the room. The CO2-data from a field study is applied to the model and the estimated flowrate is compared to the flowrate obtained by a well established tracer gas technique.