Abstract
In not actively ventilated rooms such as in schools, air exchange is insufficient, particularly during win- ter. Under the presence of COVID-19 or to reduce the CO2 concentration, the air must be filtered and refreshed as well as possible. A tracer clearance experiment using a mobile air conditioner e.g. from KRONE Kälte + Klima VertriebsmbH Germany is supposed to determine to what extent. In Szabadi [1].
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