Hygiene and cleaning

1. What does regular ventilation mean?

Increased ventilation can reduce the concentration of aerosols that may be contaminated with viruses in the room air. In the case of window ventilation, the room must be ventilated "by hand" at regular intervals when work is started. As a guideline, an interval of 60 minutes should be observed for offices and 20 minutes for meeting rooms or rooms used by several people. The so-called shock ventilation over the entire window opening area is to be used, ventilation duration 3 - 10 minutes, the colder the outside air, the shorter. If there is public traffic or a change of people in the rooms, the rooms should also be ventilated immediately after each visit.

When ventilating manually, you can be supported by the DGUV ventilation app on your mobile phone, which sets the room size and number of people in relation to the air quality and reminds you to ventilate with a timer function: Ventilation made easy: a free app against thick air (dguv.de). If you prefer an "analogue" tool, you can call up a DGUV calculation disc from the Occupational Safety and Health Unit (0201/18-34499), on which the number of persons and square metres can be set and then the time until the next ventilation can be read off.

In the case of technical ventilation, air exchange takes place automatically (e.g. in laboratories, in interior seminar and work rooms, in all lecture halls). The ventilation systems in lecture halls and partly in seminar rooms are controlled by sensors that assess the air quality.

2. How can the air quality in a room be assessedHow can the air quality in a room be assessed?

One of the factors used to assess indoor air quality is the level of exhaled carbon dioxide (CO2). Guideline values for carbon dioxide (CO2) are specified in the workplace regulation ASR 3.6. Exhaled air also contains aerosols that may be contaminated with viruses, which cannot be determined quantitatively. However, since there is a connection between the two parameters, the amount of CO2 added by people in the indoor air can be used as a measure of indoor air quality or the need for ventilation, also from the point of view of infection control.

For this purpose, the use of CO2 measuring devices or so-called CO2 traffic lights is recommended for rooms in which several people usually stay.

For centrally managed rooms, this is currently being initiated by the technical building management: CO2 sensors are already installed in the exhaust air of almost all lecture halls to control the ventilation rate. As a pilot project, the CO2 readings in lecture halls LX 1205 and S05T00B08 will initially be visualised via a traffic light display. Sensors and displays will also be installed in two seminar rooms. Green - no need for action; yellow - please ventilate or the air exchange rate of the technical system will be increased automatically and red - no breathing air unhealthy - please increase the ventilation measures and leave the room.

3. What effect do ventilation systems and recirculating air cooling units ("air conditioners") have?

First of all, a distinction must actually be made between ventilation and recirculating air cooling units, as colloquially both are often referred to as air conditioners.

A ventilation unit has separately ducted supply and exhaust air. This is rather positive, as there is a permanent exchange of air. This is usually the case in ventilated lecture halls and seminar rooms.

Recirculating air cooling units lead to a mixing of the room air; there is no exchange. Recirculating air cooling units therefore do not replace ventilation! (At no time!)

If it is unclear which type of unit is installed in a room, the Supply Engineering Department of the Technical Building Management can help.

4. How is the regular cleaning of shared workplaces and work equipment organised?

The cleaning of shared work equipment (devices, table surfaces, etc.) and workplaces must be organised by the departments themselves. When there is a change of user, work equipment and workplaces must be cleaned by the following person. Cleaning with a detergent or glass cleaner is sufficient; disinfection should remain the exception. Take the hygiene plan into account.

5. Are office door handles cleaned regularly?

The door handles are also cleaned during the contractual cleaning of the offices.

6. To whom is the lack of soap or towels in the toilets reported?

Please contact the building management at reinigung@uni-due.de.

7. How should employees or colleagues who do not adhere to the hygiene measures be dealt with?

If you know the person, speak to them in a calm tone and ask them to observe the general hygiene measures. If the behaviour persists, please contact your direct manager.

8. How should persons not known personally be dealt with who do not observe the hygiene measures?

The regular behavioural procedures for emergency situations at the UDE apply. In case of aggression, withdraw immediately and notify the police (110).

9. What should be done if employees of external companies do not adhere to the hygiene measures?

In this case, please contact the person who commissioned or coordinates the work. In the case of general construction measures, this is usually a colleague from the building management.