Health - our most precious resource

Substances that are potentially harmful to health and can provoke allergies, such as pollen, mould or old wood preservatives, can be carried into a building by air leaking in from outside.

However, as human activity in enclosed spaces results in a rise in the concentration of carbon dioxide and humidity, and a fall in oxygen concentration, controlled ventilation is vital to provide an adequate supply of oxygen-rich fresh air.

Numerous studies have shown that ensuring healthy air quality in buildings requires a combination of high levels of airtightness and controlled ventilation, with incoming air passing through a filter to remove harmful and allergy-provoking substances.

Adequate supply of fresh air

Oxygen is our most important nutrient. Experts recommend a fresh air supply of 30m3 per person per hour, based on a maximum CO2 concentration of 0.15% or 1,500 ppm (parts per million). For some activities (e.g. schools, offices) experts recommend even 800 ppm. Such a room climate requires a high rate of proactive fresh air exchange.

Ventilate properly

The best solution to replace moisture-laden interior air by oxygen-rich air from outside is controlled room air ventilation. If this is not available, rooms must be ventilated by fully opening windows and doors for a few minutes at intervals during the day.