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Buildings are becoming more and more airtight to keep valuable energy in. A permanent and uncontrolled air leakage through air-permeable windows and doors does therefore not exist anymore.
Due to construction techniques that deliver nearly airtight interiors, moisture accumulates in the building from people showering, bathing, cooking or simply breathing or sweating. When warm and humid air condenses on cool surfaces in unventilated rooms, the risk of mould growth or spore formation increases. Moisture-related damage can have adverse effects on the human body and the building structure.
In addition, insufficient ventilation leads to an undetected decrease in oxygen concentration and increase in carbon dioxide concentration. The consequences are fatigue, general indisposition and lack of concentration.
Opening windows counters these negative effects, but leads to an energy loss. A far better alternative is the installation of a heat recovery ventilation (HRV) system which is becoming more and more important and is frequently an integral component of new constructions or modernisations.