Moisture, a relevant indicator of the housing pollution
Moisture is a particularly relevant indicator of the need for ventilation in housing. Whether this is produced through activities such as cooking, showering or washing/drying clothes etc. or through metabolic processes such as respiration and sweating, moisture is produced at various times, in different locations, and in variables quantities. In a relatively airtight home without a properly designed humidity sensitive ventilation system, moisture condenses on the colder walls and windows promoting mould growth. This not only has the potential to cause structural damage, but also presents a health risk to the respiratory systems of the occupants*.
By adjusting the airflow with reference to the relative humidity, the humidity sensitive ventilation provides an effective and coherent response to the problem of condensation.
More generally, CO2 (produced by the metabolism) and cooking odours. Consequently, humidity sensitive ventilation also provides a continuous and proportional adaptation of airflow to these pollutants, to better evacuate them.
*As a liquid or vapor, water is a top cause of accidents in the building. If a relative humidity between 40 and 60% is essential for the proper functioning of the respiratory system, extreme moisture proved detrimental to both the building and its occupants.