Sweden is a country with a severe winter climate. Nevertheless, cooling during working hours is oftenrequired all year around in offices. Frequently passive chilled beams are used for providing additionalcooling. Often the chilled beams are installed above a false ceiling and thereby the room issubdivided into two compartments. From the chilled beam a plume is generated. Mock up air (returnair) is required to flow into the upper compartment to substitute the airflow generated by the chilledbeam. Therefore purpose provided openings are installed in the false ceiling.
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