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Frequently Asked Questions (FAQ)

Here you will find the most frequently asked questions and our answers. If your question is not answered on this page, please contact us directly at

How does COVID-19 infect people?
How is COVID-19 transmitted?

Mainly via infectious aerosols from indoor air.

What are Aerosols?
How do Aerosols Distribute in a Room?

Aerosols quickly disperse through the principle of Brownian motion of molecules

Are 1.5m of Distance Sufficient?

  • Sufficient against droplet infection

  • Inadequate for aerosol infection

Why do Masks Only Offer Limited Protection?  

  • Mouth and nose masks mainly protect against droplet infection.

  • FFP2 face masks don’t fit tight enough at the nose and cheeks.

  • Fine aerosols can pass through gaps and sometimes through the masks themselves.

  • FFP2 masks reduce viral load only up to approx. 79%

Is Ventilation Effective and Sufficient?

Ventilation is only effective when there is:
•    air flow
•    a temperature difference between indoor and outdoor air

Do Plastic Barriers or Face Shields Help Against Aerosol Infections?

How is the Efficacy of a Vaccine to be Understood?
Does the 95% Efficacy Mean that You Are 95% Protected?

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