Airflow rate in the dwellings.

In France, the regulation on residential building ventilation is based, since 1969, on a generaland continuous air renewal ; the fresh air comes into habitable rooms by air inlets and thestale air is drawn out to exhaust vents in the service rooms. So the air inters the habitablerooms crosses through the dwelling, is extracted in the service rooms.The Research and Development Division of Gaz de France and the CSTB have studied theneeds in each room of a dwelling (depending on the size and the occupancy) to perform newventilation system(s). The study has been conducted in accordance with the methodologydeveloped in the IEA annex 27 using the CSTB computer code SIREN95.This paper presents the main results of the study:- Its necessary to provide punctual high flow rate level in service rooms, in order toevacuate quickly humidity, especially during clothes drying, shower taking andcooking,- The extract flows needs in the service rooms are not necessary adapted to the freshair needs in the habitable rooms,- It is necessary to provide a minimum flow rate to extract pollutants due to thedwelling itself (materials, furnitures, ),and describes the principle of a new ventilation system allowing both indoor air quality andenergy saving.