How do I know which filter needs to be changed?

This depends on the specific type of dust that is filtered and can be easily established. When the red LED display shines, only the pre-filter needs to be replaced initially. You can continue using the device until the red LED display continues to shine despite having changed the pre-filter.

In this case, the main filter also needs to be changed. This replacement interval can be noted and applied for future reference.

It is also possible that the pre-filter and also the main filter both need to be changed at the same time, for instance if there is a high level of small particles in the room, e.g. smoke or process-related particles.

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