The coronavirus and ventilation in buildings
Sufficient air exchange (ventilation) is needed in buildings. This reduces the spread of pathogens that cause respiratory infections, for example coronavirus. Managers of buildings should therefore be aware of the existing requirements (in the Building Code) and applicable national guidelines.
Ventilation and the coronavirus (COVID-19)
According to RIVM, the virus is mainly spread by the somewhat larger droplets. This is based on current knowledge. For more information on the spread of coronavirus on the RIVM website. The RIVM also has more information on ventilation and coronavirus.
Rules for air ventilation
Are new rules needed for ventilation in buildings?
No, the Current rules for ventilation from the Building Code and applicable national guidelines continue to apply. There is no indication that adjustments are needed. There is no known outbreak of coronavirus in the Netherlands where air ventilation in buildings plays a leading role.
When is air ventilation good?
According to the requirements, air exchange must not adversely affect people's health. Fresh air ventilation requires exhaust of "old" air and direct supply of fresh outside air.
According to the Building Code, a properly functioning ventilation system is not part of a heating or cooling system. It carries fresh air into the building or exhausts polluted indoor air. Or a combination thereof. The Building Code lists the air ventilation requirements. In addition, there may be nationally applicable guidelines, for example laid down in a health and safety catalog. This also involves:
- use function of the space;
- use area;
- number of persons present;
- length of stay of persons present.
Business owners and administrators can use the manual with the most commonly used ventilation systems consult.
When is air ventilation not good?
In the following cases, proper air exchange does not occur:
- Table fans and upright fans only move air but do not change air. Air movement could play a role in the spread of the coronavirus. This is still unclear. As a precaution, the RIVM therefore advises against fans.
- Extraction alone does not suffice, because then there is no supply of fresh outside air.
- An extractor that filters the air and blows it cleanly back into the kitchen or room is not sufficient (recirculation). With this, no fresh air from outside enters the kitchen or room.
Should windows be able to open in addition to the ventilation system?
Sometimes only the exhaust of indoor air is mechanically controlled. Then fresh air supply requires that windows can be opened or that the window frames have grilles. Or both.