ilmanvaihtiyksikkö

An ilmanvaihtoyksikkö, often translated as a ventilation unit or air handling unit (AHU), is a mechanical device that controls and circulates air in a building. Its primary function is to provide fresh outdoor air, exhaust stale indoor air, and often to condition the air before it is distributed. This conditioning can include heating, cooling, humidification, or dehumidification depending on the unit's capabilities and the building's needs.

These units are typically composed of several key components. A fan is essential for moving air through the system. Filters are used to remove dust, pollen, and other airborne particles from both incoming and outgoing air, improving indoor air quality. Heat exchangers, such as those found in heat recovery ventilators (HRVs) or energy recovery ventilators (ERVs), allow for the transfer of heat between the outgoing stale air and the incoming fresh air, pre-heating or pre-cooling it and thus saving energy. Dampers are used to control the volume of airflow.

Ilmanvaihtoyksikkö systems are crucial for maintaining a healthy and comfortable indoor environment. They help to prevent the buildup of pollutants, control humidity levels, and ensure adequate oxygen supply. In modern buildings, particularly those with high levels of airtightness, mechanical ventilation is essential for proper air exchange. The design and capacity of an ilmanvaihtoyksikkö are determined by factors such as building size, occupancy, and climate. Regular maintenance, including filter changes and cleaning, is important to ensure the efficient and effective operation of the unit and to maintain good indoor air quality.