building block »central ventilation«
Introduce virus-proof fresh air
As an environmentally friendly alternative to window ventilation, we recommend equipping buildings with a modern and efficient ventilation system. These systems enable continuous air replacement and the recovery of excess heat. To prevent infection, we recommend an air changeover rate of six times per hour. In a room of 60 to 70 square meters, this corresponds to an hourly air flow rate of 1,000 cubic metres.
even if there are only a few people in the room, windows would have to be opened for at least ten minutes every 30 minutes to air the room sufficiently. Organizationally speaking, this is almost impossible to do.
Modern ventilation systems offer a solution:
they regulate the fresh air supply automatically, so that employees can focus on what is important - their work. In addition, ventilation systems offer the possibility of recovering excess heat and using it to heat the supply air. So it doesn't just consume energy. It is also essential to regularly service and clean ventilation systems to ensure safe operation.
What does this look like in practice?
Unfortunately, our experience shows that too little attention is often paid to existing ventilation systems. This can prove particularly fatal in the current conditions. It is a little-known fact that ventilation devices automatically add exhaust air to the fresh air, regardless of the extent to which it has been cleaned. This is due to such systems not usually being designed to heat or cool large amounts of fresh air at low or very high ambient temperatures. In addition, ventilation systems are rarely completely airtight. So the supply air mixes with parts of the exhaust air. The results are often a mediocre indoor air quality and, in the case of a pandemic, the spread of pathogens throughout the building.
Get more out of systems and save energy costs at the same time
Choosing the right filter elements therefore plays a key role in air quality. Savings are often made in the wrong places. Every day we see that filter inserts with a low filtration performance1 are used in systems. With a size of 100-150 nanometres, however, coronaviruses are far too small to be effectively separated and retained by conventional filter inserts. We therefore expressly recommend the use of filter elements with the highest degree of separation efficiency. These include, for example, HEPA filters and the virus filter element we developed for Wavebionix® ventilation units.
With this filter element, the air quality is 10 times better than when using conventional filters2. As a result, the cleaned exhaust air can be safely re-added to the fresh air. Which in turn leads to an enormous reduction in energy costs (both heating and cooling): by up to 60%, to be precise.
1 ISO coarse filter (formerly known as G4 or M5 filter) in the exhaust air or ePM1 50% filter (formerly known as F7 filter) in the supply air
2 compared to ePM1 50% filter (formerly known as F7 filter)