Ventilation: Replacing the air filter
![](../Images/png/114410763__en__Web.png)
Change the air filters (unit filter, external filter, room filter) if the filter change indicator appears. Level 3/Nominal ventilation lights up on the operating unit (only for unit filters).
Change the air filters (unit filter, external filter, room filter) if the filter change indicator appears. Level 3/Nominal ventilation lights up on the operating unit (only for unit filters).