Housing and health. What quality of air?

Summary The renewal of air is essential for good hygiene in housing. The list of polluting elements in dwellings is very long: particles, smells, acarus, allergens, formaldehyde, radon. All these polluting elements influence negatively our health. Apart from the complete elimination of the generating cources of polluting elements, an important factor for the pollution treatment is a good-working ventilation. Mechanical ventilation is the only system allowing an acceptable permanent ventilation during all seasons. It can be simple flow by mechanical exhaust and natural air income, or double flow by both mechanical exhaust and air supply. Double flow ventilation allows the filtering of fresh air and the heat transfer from exhaust to fresh air. It enables the elimination of certain allergens and the lowering, to a reasonable value, of the concentration of other polluting agents present in the dwellings inside air.