Do the filters differ from one another?

There are significant differences among air filters.

1. Air is the most important element for us humans. Therefore, it is essential that air filters do not contain any chemical substances like dyes, binding agents or solvents and that, ideally, they are made purely of synthetic materials that are deemed absolutely healthy. This sounds like common sense, but it is not always the case.
2. The installed filter surface is the performance indicator. More filter surface means less energy is required when the air flows and, at the same time, offers more filter output.
3. In many cases, only filters that comply with the old norm EN779 or do not apply to any norm at all are supplied, although the new (more precise) norm ISO 16890 came into effect globally in the middle of 2018. This new norm is based on the WHO specifications for the respective fine particulate loads PM10, PM2.5 and PM1.