Rules for ventilation of the premises at the UR


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Monday - Thursday 08 to 16 o'clock
Friday 08 to 13 o'clock



Proper indoor ventilation can help reduce the risk of contracting SARS-CoV-2 coronavirus via aerosols.

Aerosols, which are rapidly distributed throughout a room, especially in closed indoor spaces, are, according to current knowledge, the most important route of transmission of the corona virus. Increased ventilation reduces the concentration of aerosols present in indoor air, which can significantly reduce the risk of infection with SARS-CoV-2.

Increased ventilation is possible in particular by increasing the frequency, by extending the ventilation times or by increasing the air volume flow.

Events in rooms with air-conditioning systems, e.g. lecture halls, must be entered in the LSF in order to ensure ventilation via the air-conditioning systems.

Please note: This translation was made with DeepL. No guarantee can be given for the content.

For rooms that are not equipped with ventilation and air-conditioning systems:

  • Rooms must be thoroughly ventilated before and after use. The respective supervisor, teacher or event manager is responsible for ventilation.
  • For office rooms: shock ventilation at least every 60 minutes
  • For meeting rooms (and all other rooms in which several and changing people are present) the following applies: shock ventilation at least every 20 minutes.
  • For rooms in which courses are held, the following applies: shock ventilation at least every 30 minutes.
  • Shock ventilation is to be applied over the entire opening area of the windows. A ventilation period of 3 to 10 minutes is recommended in each case.
  • Fans are only permitted in rooms with individual offices.
  • A CO2 meter can be used to check the air quality; alternatively, the CO2 concentration can be calculated using a CO2 app.


"The CO2 app can be used to calculate the CO2 concentration in rooms. The calculator also helps determine the optimal time and frequency to ventilate a room. After the calculation, the calculated time can be set as a timer to remind you of the next ventilation."