INDOOR AIR QUALITY SHOULD BE OPTIMAL IN AN ACTIVE HOUSE
Good indoor air quality can prevent humans from developing respiratory ailments, such as mucous membrane irritation, asthma and allergies. It can also contribute to prevent some cardiovascular diseases. High indoor air quality helps to avoid odour problems, which can positively affect the overall well-being of the building’s occupants.
Active Houses should provide good air quality for the occupants while minimising energy use e.g. for ventilation. This means that natural ventilation through open windows should be possible, and mechanical ventilation systems should be demand driven, preferably in combination with zoning (living and sleeping) of the dwelling.
Humidity has a limited effect on thermal sensation and perceived air quality; however, long-term high humidity levels indoors will cause microbial growth. To avoid problems related to dampness and mould, it shall be guaranteed that there is sufficient extraction in rooms with periodic damp-production peaks (especially kitchens, bathrooms and toilets). The minimum exhaust air flow in these ‘wet rooms’ should be achievable as specified in national building codes or guidelines and the exhaust systems shall secure that the daily limit value for relative humidity in wet rooms such as bathrooms is below 80%.